After replacing TB I have a low frequency rumbling vibration which sounds like an exhaust leak. Only occurs when car is in gear, much worse when cold.
Had wife hold foot on brake and put trans in R. Gave a few revs and engine looked like it wanted to jump out with rear side (closest to firewall) lifting up seemingly unrestrained. Looks like rear engine mount is shot.
Don't understand connection between TB and this problem but guess that removing crank pulley bolt by bumping engine put the final blow on an already deteriorating bushing. Or, maybe just a coincidence.
In searching this and other forums it appears the rear mount is a mother to replace requiring disconnecting steering column and jacking engine.
Has anyone replace rear mount? Any tips on how to? Thanks.