+1MustangMatt96GT said:Mine did the same thing, but it was coolant in the spark plug holes.
and +1atrainsgt said:Hey Xavier remember I was having some sort of problem like that after my PI intake install, I think it turned out just to be coolant in the plug bays. Mine was wanting to sputter and backfire between 1600-2000rpms if my memory serves correct. Lasted for about a week after I got the coolant out of the plug bays.