why is my engine backfiring through my intake and lossing power when acelerating on 1994 Ford F-150

it only happens when im acelerating or going uphill..it also seems to acelerate on its own time to time..i have to put the transmission in nutrual and reve the engine to go again

by in San Antonio, TX on February 23, 2014
2 answers
ANSWER by on February 23, 2014
Several possibilities, a scanner and ignition scope will narrow it down to find out exactly what the problem is so you dont waste money on someone else just guessing and you throwing parts on it!! Now the guessing begins!
ANSWER by on February 23, 2014
In the back of engine vacuum lines fries cause of cross over emission tube leaks ,look in back of engine ,you should see if plastic vac lines Melted, its a known problem but not saying its your problem..