hi there. please help. i have an f150 with a p0708 code coming up. i have replaced the tr sensor, adjusted it correctly, checked the wiring harness for damage, cleaned all the connection pins and then today replaced the pcm. still no success. any other suggestions? ps. if i drive the vehicle forward only and take it real easy it wont bring up the code. if i drive it in reverse or in forward fast it brings the code up almost immediately. thanks, brian.

FIXED IT. it was a wrongly calibrated pcm due to the motor and trans being replaced some while ago and the computer not being swapped out. thanks everyone who helped.