1989 Chevy Beretta Rough Idle Idles up and down RPM's

Tiny
MYERSRANGER
  • MEMBER
  • 1989 CHEVROLET BERETTA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 87,000 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?
Monday, October 26th, 2009 AT 3:35 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
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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Friday, October 30th, 2009 AT 10:00 PM

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