Third Generation F-Body Message Boards - my car has know power in drive but in park it runs fine

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my car has know power in drive but in park it runs fine

my car has know power in drive but in park it runs fine. it chugs in drive it wont get up in go it take a mile to get to 55 i just did a tranny swap like week ago its got a new maf , tps ,plugs ,fuel pump, cap ,rotor, wires , igniton coil, computer plz help could it be my pinston rings???

Re: my car has know power in drive but in park it runs fine

Symptoms sound similar to restricted exhaust or low fuel pressure.
However, given you just did a tranny swap, I'm guessing the cause is there.
What kind of tranny is it, manual or automatic?
If manual, sounds like your clutch may not be releasing properly. If automatic, sounds like it could be torque converter issues.

If you find nothing in tranny, unhook your exhaust prior to catalytic converter and see if it fixes it. If not, check your fuel pressure with a gauge. you can rent one from autoZone of you don't own one.