01 grand am rough idle

I have an 01 grand am w/ the 3400. i have 201k miles on it. about 10k miles I gave it a tune up, (plugs, wires, etc) This morning on my way to work when I stopped at a light it started shaking. It was idleing really rough, almost like it was missing on one cylinder. As soon as I am above 5mph it runs great again.

is your rpm fluctuating when that happens?
give more details when this happens. Every day? Only when engine is warm? etc........

I first noticed it on my way to work this morning. I drive about 100 miles a day. I live about 25 miles out of the city and I didn't notice it this morning until I got in town and stopped at a light. It normally idles around 600 RPM's. When it's idleing rough the tach moves just a tiny bit, like maybe 25 RPM's if that. Barely noticeable. It ran great above 1200RPM's, but when I came to a stop, both in park and in any gear.

Sounds like a misfire situation. Did any of the service lights come on when this happens ?

Might double check your wires and make sure they are all tight.

and vacuum lines for leaks.

thanks for the suggestions guys. The SVS light has been on for several months, but I am 99% sure that's because one of my headlights and one of my fog lights are out. I almost never drive at night so haven't remembered to replace them yet. As soon as it stops raining here I'll check my wires/vacuum hoses etc.

yeah, SVS is stuff like your lights and SES are your sensors, engine, and transmission.

OK found the issue. Therer was a hole melted in the back of my rubber PCV elbow. Not quite sure how that got there but I replace the PCV valve and the elbow and it's back to running normal now.

Glad you found it and was an easy fix ! :thumbsup:

Yes SVS is none critical stuff, like your high heams(not your fogs). And a maybe a few other problems would trip this too. :2cents: