Ok here is one more. I had a LX Sunbird I know lame. Decided to change engine to a 186 my future father inlaw had. All went well until time to drive it home, it started to shake like a dog sh1tting razor blades. Had a gut full so straight to RPM in Heidelberg reco 186. went to drive it home still shaking. Spent $1200 all up on the car still no good. In the end it was the tail shaft out of balance. Yeah felt really stupid.