Question about 1998 GMC Sierra

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Surge at low speed

At around 10-20 mph it will surge or lope to the point you think it is going to die,if i hold the foot feed at that rpm it will do this until i let up on the gas or till i speed up. seems to be worst when it is raining, but will do it when it is dry out also.This is a real pain when driving in walmart or other parking lots.I have changed sensors,fuel filters,spark plugs,wires,tried new computer,but still have the problem.

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Verify EGR is working ...sticking valve could be holding open and creating this mess since you've tried all the common stuff to no avail.

Posted on Jul 04, 2009

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Do you have one of those oiled air filters? If so I'd start looking at the mass air flow sensor. Also this could be a fueling issuse. The pump may not be able to keep up.
Is there any codes in the PCM?

Posted on Jul 01, 2009

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Posted on Jan 02, 2017

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