Had the optispark replaced in my 95 z28 camero at a repair shop less than a year ago. Having the same symptoms again. The repair shop said that only the part is under warranty, not the labor. So im going to do the work myself this time. My question is, is there something else that has the same symptoms as a bad optispark. Ive already been told it was my catalytic converter. Paid 315.00 at Midas for a new converter and it still does the same thing. I started working on my car myself last year because i'ts too expensive to take it to a repair shop. The only reason I had it at Midas is because im broke down out of town and was told the catalyitic converter was the problem, and I didn't have access to welding equipment. As soon as I left Midas and my car reached operating temperature it started acting up. Obviously it wasn't the catylitic converter causing the problem. They were suppossed to diagnos my car before fixing anything. I think that since i am a woman, they thought i wouldnt question what they didnt do, which was find out if the coverter was what the immedate problem was. It wasn't. So ive been stranded out of town for a week and don't want to put a new opti in and still not be able to get home. It's a big job and don't really have any help.