Engine idle

TOMHEP

MEMBER
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?

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

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Check the idle air control valve and throttle position sensor

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Engine idle

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