Chevy high RPM's

Tiny
BUCK
  • MEMBER
  • GMC C1500
I have a 98 chevy truck 1500 4.3 5sp 176000
When I come to a stop my RPM's won't kick down, it tacks at 2 or more
even when I'm driving and take it out of gear it tacks to high
what could this be?
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Friday, January 13th, 2006 AT 9:54 AM

2 Replies

Tiny
DARRYL
  • MEMBER
Hello: Well sounds like an air leak, or throttle plate not closing all the way. If the throttle plate (butterfly) is not closing all the way it will idle fast. If the IAC (idle Air Control) is not operating properly or carboned up not allowing the IAC valve to close far enough could cause fast idle. A leaking gasket under the throttle body assy (TBI) if you have one could cause it. Almost any air leak into the intake manifold could cause this. Possibly a rubber cavuum hose has split open or fell off somewhere.
Good luck
Darryl.
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Saturday, January 14th, 2006 AT 11:40 PM
Tiny
BOB77
  • MEMBER
It sounds like it might just simply be your throttle positioning sensor. Fairly inexpensive to replace and any service staion with a diagnostic computer will pinpoint that right away.
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Monday, January 16th, 2006 AT 11:50 AM

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