2000 Expy 5.4 2v. Just rebuilt engine and trans. Basically everything is new, inside and out. Only non stick item is 20+ pistons. Having a real performance issue, and electrical issue. Maybe related? Been through all the wiring, ohms and VD. Chasing a random miss. Just jumps around to different cylinders. Not enough to throw a code, but I can see it on the scanner graph. All cylindersare at 220psi even. Maybe I should run a higher octane with that comp? Am I chasing pre detonation? Electrical issue: At idle, blower speed goes way down and I have far less hp with ac on. My ac isn't really cooling like it should. Ac compressor doesn't seem like its binding spinning it by hand with clutch engauged. Any thoughts?