OK I have a 2000 Mustang v6 that I just completed an SC swap on. After I tuned the computer with my SCT I started noticing weird problems a couple days later. I have returned the computer to stock and still same issue. The speedometer jumps around and the car starts bucking and misfiring. I checked the codes and I got p0340 and p0721 which are codes for the cam sensor and speed sensor. Well I read that code p0340 is usually a bad alternator so I installed a new motorcraft one and still have the same problems. I am now thinking my pcm is bad because it is an intermittent problem.
Any help with diagnosing these issues would be greatly appreciated.
Any help with diagnosing these issues would be greatly appreciated.