i just put a another 2.8 in my 87 berlinetta and she starts and runs fine but there's a lot of vibrating going on. it gets real bad when i rev her up, i don't dare go past 4 grand cause it feels she's gonna shake herself apart. anyone know why it would do this? i think i might not have tightened the engine mounts all the way...could that be it? i made sure the drive shaft was put on the same way it came off but could it be unbalanced some how? transmission mounts are nice and tight, the torque arm is a little loose but i don't think that's it....i gutted the cat too and theres a big exhaust leak right before the muffler? i dunno...help me!