I have a 2007 ford f-150 4X4 1/2 ton pickup...2 months ago truck was shaking and engine light came on...come to find out #2 cylinder had very low compression...took heads to get done..had 2 bad valves...heads were re done....ran great...few weeks later...my truck started shaking....only sometimes(missing) put scanner on it..now showing error code...on #2 cyliner again "spark plug,wire,or coil"..well i have replaced these already ..the coil is new and the wire new....and spark plug new..and is fine??? The only thing i can think of now is a fuel injector on that cylinder....(right after i had my heads done..i did have my fuel injectors flushed and cleaned)...Im going to put on injector tmmrw...has anyone ran into this probelm? Or is there a sensor also on the coil or something..please help....