So I had new engine mounts and poly dog bone bushings put in today, got the car back same exact thing, thump when taking off hard and while gas and braking it in gear. As for the erratic idle, I cleaned the MAF as KISSMYSS suggested, still no difference. I got the car home after all the mounts and was pretty pissed that the thump was still there. I kept my stock PCM and decided to put it back in and take overkill's out. Instantly the thump was gone no matter how I tried to recreate the noise, I couldn't. I guess I just got a bad one? I e-mailed will, so i'll see what he says.
