Ok so I just had the tranny bolt problem fixed, but now whenever I let off the throttle theres like a knocking noise, and if I touch the gas it seems to go away...any ideas? They are telling me I have to pay them another $300 to pull the tranny again to see if anythings wrong, even though they had it apart and said everything looked good and everything looked brand new..I've had the car on the highway and driven everywhere and it seems/feels fine just the damn knocking type noise drives me crazy..btw its a 2000 MTX-75

edit: also want to mention my starter is making noise when i start the car now, pulled it out a few cm and pushed back in did this about 4 times and still doing the same thing, if it matters at all, just thought it was weird and id mention it

I'm thinking the noise could be either the rear dogbone not tightened all the way or there is a metal bracket that is bolted to the motor that holds the exhaust up where the cat and flex pipe meet

Those would be my first 2 guesses, i hope it's nothing internal

that was a thought of my mine as well could be a loose exhaust somewhere... the starter? could be going bad. may also be a loose connection that may be causing it to "jump" around......