1994 Chevrolet Silverado warm up

1994 CHEVROLET SILVERADO
150,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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ANDREWBAUBLITS
  • MEMBER
  • 2 POSTS
When I start it cold, It starts normally then goes into it's warm up cycle and the rmps jump around. Never dies. After about 2 min, it seemed into a normal idle and runs great.
Sep 3, 2015 at 6:27 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
check for a vacuum leak under tbi unit, and soft hoses leading to pcv and map sensors.
Sep 4, 2015 at 1:31 AM
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ANDREWBAUBLITS
  • MEMBER
  • 2 POSTS
Vacuum hoses look in good condition. I replaced the temp switch and temp sensor. Condition still exists. Egr valve next? Thanks for any input.
Sep 4, 2015 at 2:20 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
reread my first reply then scan for codes.
Sep 4, 2015 at 10:59 PM
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