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dbanks12
User
Apr 3, 2010, 11:24 AM
Post #1 of 3
(1543 views)
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I have a 94 GMC truck, 5.7 litre with TBI throttle body. I replaced the fuel pump about two months ago along with a few sensors, oxygen, AIC control valve,map sensor. Plugs, Rotor & cap.
Just recently it started surging when I am at cruising speed and when
under load if you let off the gas it seems to not idle down smoothly.
Only seems to surge from about 30 kmh to around 70 kmh when holding it
steady at one speed. Could it be the regulator that is going, lots of
power, idles smoothly in park and good at highway speeds. This one is
dumb founding me, any help would be appreciated..
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re-tired
Veteran
/ Moderator
Apr 3, 2010, 11:41 AM
Post #2 of 3
(1541 views)
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Re: Engine surging
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Try a short drive with EGR valve disconnected. LIFE'S SHORT GO FISH
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dbanks12
User
Apr 3, 2010, 12:23 PM
Post #3 of 3
(1538 views)
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Re: Engine surging
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Would the EGR valve make it surge, if I take it for a drive with it disconnected and it runs okay, I take it new EGR valve would be my problem?
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