help...what is wrong with my truck
my truck hesitates and jerks on the highway. i had a check engine light on so i brought it to the shop. they said my coil was bad so i replaced it.i still have the same problem. this is what i have replaced so far : coil pack ,spark plugs and wires,air filter, fuel filter, and i did a seafoam treatment and cleaned the maf sensor. i don't know what else to do. the truck pings like crazy when i accelerate and it is hesitating and jerking. it seems like it gets worse when i run the a/c. any ideas of what this could be ? i even tried 2 different coils and it still does it. do you think i am just getting bad coils from autozone ?