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When I start the car and begin to drive the.

Tiny
GRAHAMPHILLIP136
  • MEMBER
  • 2005 CHEVROLET IMPALA
  • 170,000 MILES
When I start the car and begin to drive the engine races as you continue to drive it stays at a high idle when you proceed to slow down and use the break the car doesn't want to stop, the rpms wont slow down as the car comes to a stop the engine wont idle down I shut the car off before I shift into park so the engine isnt raceing when I shift into park. What can I do to fix the problem?
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Wednesday, January 23rd, 2013 AT 5:05 PM

2 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
What is litre size of engine? Any applicable trouble codes? Some of the national brand autostores will check codes for free.

Clean the throttle body and iac. Make sure throttle is closing all the way. Where applicable check the maf sensor, check the tps. Check for vacuum leaks. With engine running, block off the mouth of throttle-body, any effect? If no effect, you have false air getting in there from somewhere?
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Wednesday, January 23rd, 2013 AT 5:50 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Just to add, blocking off the mouth of throttle-body should kill the engine.
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Wednesday, January 23rd, 2013 AT 5:52 PM

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