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1998 Chevy Truck surges

Tiny
JOHNRYMEL
  • MEMBER
  • 1998 CHEVROLET TRUCK
  • V8
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
I have a 1998 chevy pickup and it started to stumble and hessitate if you hold it steady. It will surge going down the road. I have replaced the fuel filter but did not fix it. I cleaned the IAC valve and checked vaccum lines for leakes but no change. Thanks for the help.
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Wednesday, January 16th, 2008 AT 2:24 PM

3 Replies

Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
Sounds like a sticking exaust valve or a failing head gasket.
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Wednesday, January 16th, 2008 AT 3:50 PM
Tiny
DAVEW741
  • MEMBER
  • 5 POSTS
It is the egr valve
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Saturday, January 19th, 2008 AT 8:39 PM
Tiny
JOHNRYMEL
  • MEMBER
  • 2 POSTS
It is the egr valve[/quote:dfd3084dcd]

i think I got it figured it out. I suspected bad gas and I poured some b12 in it and immeditely seen a difference but still some hesitation. I am gonna try to flush the fuel system and hopefully that will fix it for good. Thanks everyone for the help.
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Sunday, January 20th, 2008 AT 7:52 PM

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