I have a 1990 F150 4x4 engine has 50k miles trans just rebuilt (2000rpm TQ). I cannot get the truck over 35mph when it is warm out with an awful shake to the front of the truck. I know the TV cable is not quite exact, but it is in the ballpark. I floor the gas petal and it will not do anything at all when in OD. On hills it will slow down to 30 and then shift down, but i still will not gain speed. I have changed the MAP sensor, and tested the TPS, so neither of them could be bad. Is my ECU bad? I don't get any codes when I test.