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06-04-2013, 12:24 AM
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#1 |
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Registered User
Join Date: Jan 2007
Location: shoreline, wa
Posts: 1,565
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running rough after 20 min of driving HELP!
my 68 with a 327 sat all winter long in the garage and was started about every 10 or so days, i tried to drive it last month and it would spit, sputter and die once i got about 100 yards. i replaced plugs, wires, fuel pump, fuel lines and filter, carb gaskets and vacuum lines. now it runs great for about 20 min then it seems to bog down and the idle gets cut in 1/2. now it is idling all over the board. what else could be wrong?
the carb is about 1 year old
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68 swb fleet bagged on 20's 327 with 4 speed http://67-72chevytrucks.com/vboard/s...d.php?t=223308 2014 Chevy 2500hd duramax CCLB |
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06-04-2013, 12:32 AM
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#2 |
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Senior Member
 
Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,373
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Re: running rough after 20 min of driving HELP!
Fuel? Just a guess...
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A husband can be right...or...A husband can be happy.  67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk.  1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc   JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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06-04-2013, 12:37 AM
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#3 |
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Account Suspended
Join Date: Oct 2012
Location: Salt Lake City, Utah
Posts: 3,331
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Re: running rough after 20 min of driving HELP!
Try a good gas additive, like Lucas Oil.
Posted via Mobile Device |
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06-04-2013, 06:54 AM
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#4 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: running rough after 20 min of driving HELP!
next time it happens take off your gascap to see if that solves the problem
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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06-04-2013, 12:41 PM
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#5 |
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Active Member
 
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: running rough after 20 min of driving HELP!
After you check the above check for debris in carb and/or fuel filters, also there's a possibility of flooding due to sticky gummed up needle valve, even defective vacuum advance or problems with the distributor.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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06-05-2013, 09:44 PM
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#6 |
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Registered User
Join Date: Jan 2007
Location: shoreline, wa
Posts: 1,565
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Re: running rough after 20 min of driving HELP!
Took the carb off and dropped it off with the local carb guy, he called me an hour later and told me to drop the tank and flush all fuel lines. Someone someware decided it would be fun to put sugar in my gas tank...
Posted via Mobile Device
__________________
68 swb fleet bagged on 20's 327 with 4 speed http://67-72chevytrucks.com/vboard/s...d.php?t=223308 2014 Chevy 2500hd duramax CCLB |
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06-05-2013, 09:49 PM
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#7 | |
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406 Powered
Join Date: Aug 2009
Location: waynesville,n.c.
Posts: 877
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Re: running rough after 20 min of driving HELP!
Quote:
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70 GMC 68 c10 2002 silverado 72 4x4 |
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06-05-2013, 10:02 PM
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#8 | |
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Registered User
Join Date: Jan 2007
Location: shoreline, wa
Posts: 1,565
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Re: running rough after 20 min of driving HELP!
Quote:
Posted via Mobile Device
__________________
68 swb fleet bagged on 20's 327 with 4 speed http://67-72chevytrucks.com/vboard/s...d.php?t=223308 2014 Chevy 2500hd duramax CCLB |
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