I bought my automatic SS (98) a month ago. Had no problems with performance stock. But since I've added a few mods and done the free mods, I'll go WOT at about 60 mph and it feels laggy as hell, doesn't feel like its misfiring but like its not getting enough air or fuel. Almost feels like a stock lt1. I gave it WOT LAST NIGHT AND GOT an SES light. I've added a K&N air filter, SLP Lid. I've grinded down the ridge in the throttle body, cut the EGR tube, removed a section of the air dam, cut the filter tray and bypassed the coolant to the throttle body. Besides getting the check engine light checked, any legitimate suggestions on repair? I've got it boiled down to a dirty fuel filter, weak fp or bad spark plugs/wires. Car drives normal under normal driving situations.