2000 Oldsmobile Silhouette engine running rough

BOB HEPPNER

MEMBER
2000 OLDSMOBILE SILHOUETTE
3.4L
6 CYL
2WD
AUTOMATIC
150,000 MILES

My 2000 olds silhouette has been running rough. I especially notice it when running idle in any gear. When I turn on the air it excentuates it even more. I replaced the fuel pressure regulator and pvc not too long ago. Any suggestions what this could be? I have never had any plugs changed. Someone suggested it could be an issue with the transmission? I had a new one put in about 4 yrs. Ago. Please advise? Thanks

6 Replies

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

Can you tell me what the engine idle speed is when this happens?

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Sunday, July 6th, 2014 AT 6:29 PM

BOB HEPPNER

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8 POSTS

The idle is right around 800-900 rpm.

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Sunday, July 6th, 2014 AT 6:50 PM

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

That is where it should be. To be honest, I would remove the plugs and check their condition. It may just need a tune up. If you need directions, let me know.

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Monday, July 7th, 2014 AT 7:27 PM

BOB HEPPNER

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That sounds like a good plan. Directions would be great. Thanks.

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Monday, July 7th, 2014 AT 7:50 PM

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

Here are the directions for replacing the spark plugs.

https://www.2carpros.com/articles/how-to-change-spark-plugs

I have also added how to check for engine vacuum leaks. A vacuum leak can cause the engine to run rough.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge