Hi I have a 05 lariat supercrew 5.4 4x4 and have lately noticed that at around 1000 rpm and less than 5 mph going up steep grades my truck shutters really bad. I had a transmission fault way back but ford opened it and came to the conclusion it was a bad PCM so it has been fine since then but this shuttering is worrying me I am still in warranty for 20000. Any help is much appreciated.
Thanks
Dave

 

might be a bad COP.

 

I can check the COP but the plugs and the cop were done 20,000 miles ago. it also has 122,000 on the truck.
Thanks