Engine idle

Tiny
TOMHEP
  • GMC C2500

I have a 1990 GMC 2500 Sierra with automatic transmission and 350 engine or 5.7 with 50,000 miles. I just replaced the engine and when I started it it will not idle but runs at about 4000 RPM's. What wrong?

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Saturday, November 17th, 2007 AT 5:46 PM

1 Reply

Tiny
RASMATAZ
  • MEMBER

Check the idle air control valve and throttle position sensor

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Sunday, November 18th, 2007 AT 7:41 AM

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