I don't have a fix but I have the same problem. I thought I'd let you guys know

The "rich running engine" theory sort of makes sense to me though… Like most other members here I let my car idle for at least 1-2 minutes before I go to work in the morning but I’ve noticed two things that nobody else had mentioned in this thread:

1. Right after the carts starts my RPMs go up and down 3-4 times. It’s sort of a like a wave pattern. Up and down until it settles at around 2100rpms. Anybody else with the same symptoms? It only happens when the engine is cold.

2. The second thing is that my exhaust smells a little funny when I first start the car. It is a rather strong smell of unburned fuel. Does that mean the car runs rich? If so, would that have anything to do with the sensors everybody is talking about?

My car is a ’92 and has 160K so that could be the problem itself L I have no clue how the guy before me took care of the car – I bought it off an auction. On a side note: I also have problems starting the car… Sometimes I have to try 2-3 times in the morning…

Thanks!
Nick