Originally Posted by got mud?

ive got a 88 nissan 4x4 truck w/z24 motor all my problems started when i was going to work this morning and any more than half throttle my truck will cut out and backfire untill i let off the gas im not sure where to look other than i know its not the valves,timing chain and gears,plugs ,plug wires,fuel filter or air filter because i relaced all of this when my head gasket blew i also had the head cleaned and surfaced when i had the new valves and seals put in any help would be great i also was checking my coils and found the exhaust coil doesnt fire as much as the intake coil but im not sure how much spark it needs being its the exhaust side HELP PLEASE I MISS MY TRUCK