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1998 gmc sierra 2500 5.7 auto, had to drive through some deep water to get to the farm today and soon as a got through the water she started to iddle extreamly rough and went up a small incline and she stalled, if i do get it started vary rough iddle but soon as i excle she stalls and a pain to get restarted

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Check the electrical system--distributor cap and plug leads for moisture. Check all wire connectors for water ingress and dry out. If you were driving for some time then the cat converter would be hot and immersion in water such as you describe is the best way to crack the insides and block up the exhaust.

Posted on Oct 11, 2013


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Posted on Jan 02, 2017

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SOURCE: 1998 GMC Sierra- runs rough then stalls when

had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

Posted on Jun 06, 2009

  • 1374 Answers

SOURCE: 1999 gmc sierra starting back firing and ran rough

Sounds like the fuel pump. Simple check put key in ignition turn to on position Pump should buzz. Another way to check use a rag and hunt down schrater valve on the fuel rail on engine. Wear eye protection put rag around bottom of schrater valve and press down on valve. Fuel should shoot up at you if not your pump is bad.

Posted on Aug 18, 2010

  • 1 Answer

SOURCE: MY 1997 GMC sierra 2500 diesel stalls. you can be

Purchased a new gray Standyne Fuel Solenoid Driver kit with heat sink and extended wire harness. Mounted on left fender well and was able to do the work myself in about an hour. No need for injector pump work. Solved stalling issues and it starts up easier as well. These are all over ebay. Very common issue with this engine, and the GMC knuckleheads knew about it and didn't do anything to educate dealerships on a permanant fix.

Posted on Aug 05, 2011

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