I did the head gasket overhaul and and replaced everything and all went back together as I took it apart.. But for some reason I am getting spark and fuel to the cylinders but no fire except and occasional boom that sounds like it's down in the header.. I pulled the plugs and they are in good condition but are wet with gas.. I checked the wires and made sure they are not crossed and I am getting good spark at the caps.. IS THERE A CHANCE THAT I FOR SOME REASON COULD HAVE RE-INSTALLED THE IGNITION COIL BACKWARDS?? I am pretty sure it mounted up right but it's the only thing I can think of that would keep the truck from firing. I have gas and spark, but if for some reason I could have put the IM in reversed?? All of the wire's would still run the same from the IM to the plugs so that would not be an indication, is there a way to tell if it is mounted up side down or backwards??