I gutted my uppipe a couple of months ago, and recently got cel's p0301 and p0303 at the same time. These are cylinder 1 and 3 misfires. But they don't flash and I don't have any misfires that I can hear or feel. I read in the service manual that this could be a lean or rich condition. Has anyone else heard of this? Second, if so what was the fix, I guess that the engien could be running lean, I just would hate to have to buy an engine management to adjust fuel so as not to throw a cel. Any help is appreciated. Also, I know about the exhaust temp to high cel and the fix, so that is not the problem.