Have 11 SHO. Have replaced plugs, wires, boots, most coils and all the fuel injectors. I recently had a cylinder 3 misfire and changed the coil and plug (the plusg a 2nd time) and yesterday my cel went off is when doing.a hard acceleration over 65 (up a hill.or passing). Mainly had done all city driving since the aforementioned plug replacement. Car shirts good, drives good otherwise no issues with acceleration. I've spent thousands trying to get it right. I need some ideas what could be wrong!?!