I was racing last night when all of a sudden i came to a stop and the truck was idleing really rough, as if i had a cam. It is really rough and once i reach 40mph it starts to shake really bad. When at idle, you can feel it misfiring, which is why i think it might be a plug. Any ideas, i'm going to probably take it to the shop so i can get it scanned, but has anyone encountered this before? Hopefully that is all it is. Oh and the check engine light came on as well.

 

maybe a bad coil pack,if you blew a plug out you would definetly hear it

 

valve spring 85%, or 15% plug.

 

The worse possible case if you were at wot for a fair time you may have leaned out and burnt a valve.

With engine at idle pull each coil plug in turn and you should get some idea of which cylinder is down.

Remove your plugs and carry out a compression test.








Then go down and get that $$$$$ £££££ loan from the bank

 

Pull the plugs. It may be as simple as a broken insulator or electrode. Happenned to me, when I ran a tank of unleaded plus.

 

turned out to be a lose coil pack, good thing too.