russ98stang

So what would happen if i had the 96-98 spark plugs in my 99-04 cylinder heads? would it cause it to misfire or run fairly rough?

blackstallion666

If they are damaged or fouled yes they could cuase the car to run rough. But you could also have bad wires or coils cuasing it to run rough. As far as i know those spark plugs would work fine. But i would make sure there the updated version with the longer thread on the spark plug.

russ98stang

what do you mean by longer thread on the spark plug? so the plugs from a 98 will work in the new edge even if they have different part numbers?

blackstallion666

as far as i know there the same

russ98stang

ok, the guy at the parts house said they were different so i went ahead and bought eight new ones.