I was experiencing a low rpm stubmble under 2500 rpm's. It seemed to be heat related. The car would stumble and miss untill it reached 2000 or 2500 rpm's. Once the car reached 2500 rpm, after the car was at operating temprature, it would take off like a bat out of h3ll. I took it to a local mechanic and he diagnosed it as a bad opti-spark. Now, this is not your ordinary mechanic. He is known as THE GM mechanic in this area. So, I trusted him and let him replace the opti spark and I have never been so pleased. The car has performed better than it ever has since I have owned it. I know this may not mean sh$t to many of you, but I thought I would post my fix to the most common problem we experince with these cars. By the way, the car is for sale now that the problem is fixed. Check my signature for the link to the info. I am upgrading to a Vette.