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Old 09-08-2003, 11:53 AM   #1
hank
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idle problem

have had this nagging problem for the past week or so...

truck starts fine and runs fine but once a day or so it starts to idle really rough at stoplights. it runs fine when i put my foot into it a bit, but returns to running roughly when i stop again. if i kill the truck and restart, the problem goes away.

my truck is a 71 cheyenne. it has a 350, all stock except for HEI. just changed my spark plugs/wires 3 months ago when i switched to HEI.

any thoughts or help are appreciated.
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Old 09-08-2003, 12:45 PM   #2
truckster
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When a motor starts running rough at idle, I start looking for a vacuum leak.
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Old 09-08-2003, 12:57 PM   #3
71-longbed
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Angry

mine too ...its very unpredictable .... and annoying when it happens
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Old 09-08-2003, 01:06 PM   #4
cdowns
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yep i'd look at a vaccume leak and the advance mech ecpeciaaly if it was a used piece that u put in also when was the last time u changed the fuel filter??
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Old 09-08-2003, 01:08 PM   #5
biglou55
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I had that problem with my 90 chevy pickup it was the wires in the hei. they were corroded where it plugs into the module . it would hunt for an idle until you got on it then it had enough spark to run good. it also was interrmitent and hard to diagnos. just my 02#
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Old 09-08-2003, 01:48 PM   #6
lukecp
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Yup...check for a vaccum leak as stated above, and check what your timing is running at.
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Old 09-08-2003, 02:26 PM   #7
hank
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thanks for the suggestions. will check for a vacuum leak tonight.
as for the fuel filter idea, you may be onto something. i just changed it, however, i just had my gas tank out to paint my truck. maybe i stirred up some bad stuff and need to change it out again.

thanks again.
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