Car has great highway power, and smooth as silk in idle out of gear. As soon as it goes into gear the whole car vibrates and shakes. I can hold the go pedal down a bit and smooth it out but in 700RPM idle in gear it will vibrate your fillings out. No black smoke, even on hard accel which seems odd and in gear when hot it smokes black/grey in gear in idle. Already replaced motor mounts, injectors, filters, etc. As a side note that may or may not be related, I cant get a normal reading for chain stretch by using the cam tower notch method. When those notches are dead on the stretch is like 20 something ont he banacer ring and I know it cant be that high. Ideas?