I Let my 3800sc powered fiero sit for about 2 months and it has developed a wierd running issue when started up.

It basically revs a bit and drops a bit and does that for a while. I can drive it and it seems to go away. It has full power . After a short drive it doesn't show any of the issues. Turning it off and back on after driving around it doesn't show any of the issues. Just when it's cold and has been sitting for a bit.


Any Ideas?

Is the difference that the battery is disconnected during these long times? If so it's normal.

The Battery is connected during the down time. It's a red top optima.

idle air control valve.

What are you running for an air filter? I Have a K+N on mine and it will do the same thing. I don't think the computer is set to to adjust with that much air flow. Not sure, it goes away pretty quick foe me.

It's a k&n but its been fine for 1000 miles