I cannot find my original post, but I was having an issue with my 2003 Acura CL Type-S on startup. It would turn over, go up to about 1,000 RPMS, then shoot down to about 300RPMs and often times stall, when it didn't stall it would jump to 1200 RPMS and slowly drop down to 800-1000 RPMs. I recently replaced the alternator and that fixed the issue completely. I hope that this helps somebody out there!

 

Hmm, kind of strange. I wouldn't expect an alternator to cause those kinds of problems.

 

Interestingly enough I wasn't expecting replacing the alternator to fix the issue, the alternator had just went out, but it seemed the resolve the issue completely. The alternator looked extremely old, wouldn't be a stretch in my eyes that it was the one originally installed on the car.