This car is a supercharged S281 Saleen. At high RPM the car is "breaking" up. It doesn't really feel like a misfire. It only seems to happen between 5-8 psi boost. It has a P0402 Excessive EGR, DPFE is at 4.80v, and P0172/175 rich both banks.

At idle the LTF... Login to read more.