Idles eradic, will stall with up and down idle, no power, hesatation

Tiny
ANDYKOZ
  • MEMBER
  • 1991 CHEVROLET CHEYENNE
  • 150,000 MILES
The truck sat about a year. Problem there right away. Idle goes up and down. Hesatation on takeoff, no power. Changed egr valve and map sensor no change. If I take vacume line off map sensor and plug it it runs great. Idle is high without vacume line but steady. It also has pleanty of power with vacume line off. Do not know what to do next thank you
Monday, February 27th, 2012 AT 11:37 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the tth idle air control valve and also the TPS closed and wide open throttle voltages-
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Monday, February 27th, 2012 AT 11:40 PM
Tiny
ANDYKOZ
  • MEMBER
  • 2 POSTS
The air control tested ok also the tps ok
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Tuesday, February 28th, 2012 AT 11:14 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Go to this link: https://www.2carpros.com/articles/engine-hesitates
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Tuesday, February 28th, 2012 AT 6:05 PM

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