97 f150. Truck is only missing & backfiring when below 1500 rpm and light pedal, fear while towing its gonna act up bad. any ideas? runs like a champ at 2500 plus, sometimes it doesn't act up under any circumstances. new plugs wires coils cam sensor. no codes, runnin out of ideas. thanks.

 

What plugs and wires did you use? Did you put the wires back like the factory had them routed? Have you replaced the fuel filter? Good luck!

 

Pull the plug boots and check for condensation. Also cracks or white lines indicating arcing on the boots.

If you got water then blow them out real good and cover all the boots with dielectric grease real good and you won't have that problem again.