Question about 1998 GMC Sierra
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.
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
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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