frustrated - TX
driving down the road it is fine as long as going on level road. when i get into hilly roads the thing sometimes misses but most of the time when it shifts down out of overdrive it shutters or vibrates at 2500 to 3700 Rmp at 3750 it smooths out and then when it shifts back into overdrive smooth. my code reader gives me no codes have changed fuel filter,checked fuel pressure, changed spark plugs numerous times. sometimes when the miss is real bad i can codes never the same cylinder but most of the po0300. any ideas would be grealy appreciated i am lost

There are several forums here that can help you out. Click on the Forums tab at the upper left and scroll over the list to find the one that best fits your application. If this is the modular V10 I would try here: https://www.ford-trucks.com/forums/forum49/ The Super Duty board can also be a good one to checkout.




