ModernCamaro.com Founder / Former Camaro Disciple
Join Date: Jan 2006
Location: Chicagoland, IL
Sure sounds like the optispark was the problem, but if you already replaced it, then yeah something worse is wrong.
Check voltages both right at the coil and the end of the plug wires too, perhaps the plug wires could need replacing if you find a significant loss there.
Wouln't hurt to replace both the plus & the wires anyway, especially if they are still the factory ones at that mileage.