Got a real problem now. When i put my tgp in drive it starts shaking a little and when i accelerate if i give it a little gas my car shakes a little and eventually will reach 55mph but no higher, If i give it to much gas which is barely any my whole car starts shaking. The mechanics cant find anything wrong with it so im stuck. Need help

Check to make sure you have spark from all coils.

Do you still have a converter?  My converter was plugged, I thought the transmission was going.. turns out it was that.  Could be..

Then again, mine was shaking and I dropped my cat thinking it would be clogged and it was just fine, but good idea to do it anyway.  Turned out to be a combination of about 50 or so things that was making the car run like shit. But I fixed everything and the car was all better, upgrading and modifying at the same time.  Now it is running stronger at 145 k miles than a brand new TGP in 1990. So keep replacing shit, it will eventually be worth it.