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Update: Sorry for such a late update on getting my 40th annioversary fixed and back on the road again. The final solution and piece the fixed the last bit of issues was to install and upgraded chip in the ECM for EGR delete and reprogram cooling fan temp sensors. I have driven the car on a...

I had a new CTS installed but got the code 15. I went thru several tests to eliminate a bad plug, failed ground, broken CTS plug wire, etc. I even sent the ECM off to be tested and it came bad OK. So, I went and got another new CTS and that fixed the problem. Had to have been a bad CTS originally.

Yes. The optispark died last May on our way to Orange Beach Alabama from just north of Nashville. We werew about 35+ miles south of Birmingham. It took me a long time to fiond someone to fix the car. I purchased Petris Enterprises optispark kit. It came with everyhing needed to include...

I have a 40th Anniversary convertible. For almost a year now I have been searching for a trained and reliable technician to replace the optispark. So about a month ago I found a local automotive repair shop that does work on Corvettes but is somewhat limited in their knowledge of the C4. I...