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I would be investigating the fuel pressure and injector operation as they also cause misfiring. The vibration may be from the injectors not operating properly. ( leaking or squirting and not atomising )
exhaust resonance is unlikely
vibration is caused by something spinning that is out of balance
it can also be from a misfire or a mechanical problem
considering the mechanical problems
harmonic balancer - replaced delete reference unless loose bolt
loose clutch pressure plate --no information as to auto or manual--possible
cracked flex plate--no information as to auto or manual ---possible
failing cam shaft lobes --cam nobes wearing off causing valve timing problems --very possible
faulty hydraulic lifters --pumping up and holding a valve off the seat -possible
hydraulic follower failure --excessive valve clearance altering valve timing --very possible
ignition timing too far advanced -- tune up should have checked that but is a possibility
failed water pump bearings --noisy but a possibility
viscous fan hub ( if not electric fans )-- a distinct possibility--bearing failure and fan running off center-off balance
injectors --- any injector squirting but not the same amount as the others will cause a harmonic unbalance --possible
except for the cam shaft as mentioned , the engine has done 30.000 miles so any fault in the rebuild would be shown up before that mileage was done
drive line problems ---unlikely as you state it vibrates when stationary and that confines it back to the engine and transmission
only parts spinning are the engine parts and the input shafts , torque converter or clutch
IF your ****** was removed and re-installed there is a good possibility that there is a problem withe torque convertor. either it is not installed or seated properly or the weight block welded to it may have come off. Also your flex plate ( the part that your torque convertor mounts to) may be warped or bent during re-installation Hope these ideas help you out..
A transmission problem would not make the steering wheel vibrate. Have you ever had the Transfer Case fluid changed? This is required every 50K miles. A qualified transmission technician should evaluate your problem.