GM and GMC
Head Gaskets and Valve Covers

I have a 1997 GMC with a 305 vortec v8 the motor revs at 2000 - 2500 hot or cold i have changed the plugs plug wires and checked all the sensors do you think it could be the dome gasket?

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Wiki User
2006-08-07 21:49:40

An air leak at the head can cause reving at idle. When you

changed the spark plugs what did the old ones look like A light

gray or white color would indicate a lean condition. This could be

a head gasket or a leak in the intake between the injection system

and the intake valve.

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