Can someone please help? When I crank my 97 Ford Thunderbird 3.8, it idles fine, but when I put it in gear and press the pedal it barely moves, I have to press the pedal to the floor to get it to move and when it moves it takes off slow. Once it get going, pedal still on the floor, if I let off the pedal I can feel it pick up speed. I have replaced the Cats, fuel pump, fuel filter, EGR valve, MAF, TPS, fuel regulator, O2 sensors, head gaskets, timing chain and gears, you name it I have probably done it. I am at a loss, plainly put, clueless at what to do next. If there is someone who can help me please feel free.
Thanks in Advance,
Johnny

 

John,
A couple things come to mind.
Are you sure that it is an engine problem and not a trans problem?
A torque converter with a non functioning stator (free wheeling when it should be locked)
Also, is it possible you could have a collapsed exhaust system somewhere internally?
Now that I've given you some things to check, let us know what, if anything, you find.

 

i was gonna say maybe a plugged catylitic converter??