Mechanics

CHEVY ROUGH IDLE IDLES UP AND DOWN RPM'S

1989 Chevrolet Beretta

Engine Performance problem
1989 Chevy Beretta 6 cyl Two Wheel Drive Automatic 87000 miles

Rough Idle. Idles up and down on RPM's Gauge.
Does it need a Idle Speed Control? What Corrective Action Needs to be Taken. Also What Parts are Needed for a Complete Tuneup?
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Myersranger
October 26, 2009.




Before replacing anything, has the check engine light come on? It could be a throttle position sensor (TPS) or idle air control valve (IAC) or as simple as a vacuum leak. Without a check engine light and trouble code, it becomes a guessing game.

Take the car to a nationally recognized parts store if the light is on and have them scan it. Most will do it for free.

As far as a tune up, spark plugs, plug wires, distributor cap and rotor. I usually like replacing the fuel filter and checking the air filter and PCV valve.

Let me know what you find with the light.



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