My 3.4 shakes when put in Drive

My 1994 camaro 3.4 starts to shake as if it had a misfire when put in drive i have had this problem for years and my car only has 41,000 miles. I put new plugs, wires, coil paks, fuels filter and more can some one help me and fast to take away this problem, THANKS :confused:

*shrug* Check your motor and tranny mounts?

timing belt?

BELT?

...BELT!? This isn't a Honda, its chain powered, bia! Besides, you 99% of the time, dont know those are bad/going bad until they snap :P