Please help I overhauled a 96 Land Rover discovery SE7 with manual transmission. I took the engine and transmission from this truck and put it in an 97 disco automatic that had a bad engine and transmission. The truck runs fine while its sitting and when I drive it cold. But once it gets to normal operating temp it acts like it does not want to go. I get popping threw the intake and it looses power I have to keep on down shifting to get speed back up then it just quits. Any suggestions would be helpful.