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Originally Posted by kenbarnesjr
When I start my 95 monte carlo (3.4) it revs high to about 4 or 5 and then drops. it continues to do this until it gets warm even cutting out if i dont hit the gas. just changed the dile air control motor and it's not that. Could it be the spark plug wires are old or something to do with fuel injection. Need help if anyone had similiar problems
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I have A 95 3.4 DOHC doing the same thing. From what I've learn, Its either the Intake or Head Gasket. I tryed changing the all the sensors you can think of, and the idle still has a mind of its own. It doesnt stall, and will start fine. But after it is placed in gear, the RPM jump anywhere to 3000. It is driveable but you are off to the races. At times it will run normal, but it I shift (automatic) into park it RMP's race off again. I had it into a dealer and he said its a vaccum leak. On top of this, it leaks oil from somewhere around the rear head.
At this time I have the intake off and I am hoping that by replacing the upper and lower gasket , this will solve both problems. I have found anti-freezze in the top of the rear head. But there is no water on the dip stick. There is however water in the plugs.
Being DOHC I really dont want to pull the heads. I looked though this site and found several idle issue that end up being the intake gasket. I also dont have the tools needed for that job.
I dont know if this info helps you. But your not alone in this.