I have a few questions that I'm sure you all can help me answer. I just bought an '02 4.0 that I love driving, but when I get up to highway speeds the AC will cut out. This is not a big problem, but I hope it is not something seriously wrong. Also, when I start out from a stand still, sometimes it sounds as if my engine is running at a higher RPM, but the gages show nothing different. Do I need to reset the PCM? I appreciate the help.