I tuned a corner and when I got back on the gas it didn't have full power, like there was one cyl misfiring, I turned another corner the other way a few miles up and it really went to ****. I have p0300,301,302,305, p0432. I replaced the last 3 remaining factory coil packs. That didn't do it, the. I replaced the ifs, that wasn't it. Where should I start now?