99 2500

1999 GMC C2500

Tiny

marshallkendrick1

January, 7, 2011 AT 3:52 AM

99 gmc 5.7 vortec hard to start when it is warm doesnt do it always run for awile the shut down 15-30 min try to start backfires hard to turn over misses when it does start it runs ruff till you take it out on hiway it will do this if you start it and let it idle a long time once in a while it wont start untill you let it cool down a long time new fuel pump cataletic converters 02 sensor no codes runs good starts good cold

FOUND 3594 RELATED QUESTIONS

1991 Hard To Start

41 ANSWERS
4 IMAGES

Engine Does Not Stay Running

33 ANSWERS
8 IMAGES

1 Answer

Tiny

rasmataz

January, 7, 2011 AT 4:40 AM

Clean out the idle air control valve and EGR valve and test throttle position and manifold absolute pressure sensors-

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