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12-17-2011, 06:30 PM
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#1 |
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Registered User
Join Date: Nov 2010
Location: Salt Lake City, UT
Posts: 33
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Sluggish at High Speed
1970 Chevy C-10 5.7L Gas 400 Trans.
Had the breaks inspected, bearings and alignment done. All is well. Gping 30-45 the truck runs well. Going about 65-70 it seems sluggish. I am not sure what could be causing it. New spark plugs and tune up done. Just seems as though it is trying to pull back when I am going that fast. Any ideas? R |
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12-17-2011, 06:40 PM
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#2 |
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"brand new second-hand"
Join Date: Feb 2007
Location: White House, Tennessee
Posts: 526
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Re: Sluggish at High Speed
check the hose coming off "ported" manifold vacuum( on the carb) to the distributor for leaks and cracks. Also, check to see your vacuum advance is working on your distributor. If those are good, look for anymore vacuum leaks and then check your fuel filter,fuel pressure and float level on your carb.
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Steve 69 3/4t custom camper tilt,am/fm,speed warning,air gauge,buddy buckets,aux battery, big block,p/s,p/b,a/c 67 Camaro 96 Impala ss-sold 04 hybrid Honda-saving gas for the blue truck!:b69: |
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12-17-2011, 06:45 PM
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#3 | |
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I built it
Join Date: Sep 2008
Location: Bakersfield ca
Posts: 744
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Re: Sluggish at High Speed
did the truck recently start being sluggish? my truck is like a garage door on the freeway at all times haha
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'72 k10 lwb 454, th400, 205, d44ft, 12b rear, 4in skyjacker, 35x12.5-15 superswampers, 4.56, blazer tank. painless wiring harness '98 dodge 3500 12v 5sp 4x4. the truck that actually runs Quote:
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12-17-2011, 07:04 PM
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#4 | |
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Old Skool Club
 
Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Sluggish at High Speed
Quote:
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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12-17-2011, 11:30 PM
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#5 |
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Registered User
Join Date: Nov 2010
Location: Salt Lake City, UT
Posts: 33
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Re: Sluggish at High Speed
It started about 2 months ago. Before that it used to run beautifully
Posted via Mobile Device |
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12-18-2011, 12:04 PM
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#6 |
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Registered User
Join Date: Dec 2009
Location: Atlanta, Ga.
Posts: 1,050
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Re: Sluggish at High Speed
Mine was doing that and it turned out to be trash in the gas and had the filter clogged.
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I don't think we get smarter as we get older. We just run out of Stupid things to do. |
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12-18-2011, 12:06 PM
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#7 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,546
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Re: Sluggish at High Speed
Cam might be going flat. Pop off the valve covers and check the rockers.
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12-18-2011, 12:14 PM
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#8 |
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Registered User
Join Date: Nov 2010
Location: Salt Lake City, UT
Posts: 33
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Re: Sluggish at High Speed
I highly doubt it's the cam. It was installed brand new last year. It's a high performance can too.
 Posted via Mobile Device |
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12-18-2011, 01:00 PM
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#9 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,546
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Re: Sluggish at High Speed
New springs too!!
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