Engine Vibration!!!!!!

Heres the deal i blew up my engine and replaced it with the same 2.8 V6 engine i had in it before i just got it in and started it up and the engine vibrates dramatically does anyone have a solurion to this problem?

Check timing?
Motor mounts tight?
Tune up?

Heres the deal i blew up my engine and replaced it with the same 2.8 V6 engine i had in it before i just got it in and started it up and the engine vibrates dramatically does anyone have a solurion to this problem?

maybe a useless reply assuming you put all back as it was, but ... i had motor related vibration that was found to be few missing bolts from top of tranny-motor connection 8-O ;-)

also, news to me from these forums and checking my haynes book, there is a vibration damper on outside front of motor down behind lower crankshaft pully and timing chain cover ... could something be wrong here ? ... but like blazerlt said, check the easy stuff 1st.

what year is the truck and what year is the motor you are putting in the truck there are two different flywheel one is internal balance and one is external I had the same problem.