01 f550 misses

[d_lperformance]

got an 01 f550 replced #5 injector awhile back ran great for 2 weeks #5 cyllinder again checked wiring , connections head pressures replaced injector again ran good for 5 days this morning started missing again #5 cylinder again anyone seen any issues with international injectors or should i look into something else any suggestions

 

[DISTURBED]

Check the main harness were it comes up over the valve cover. The connector is right on top of the valve cover were the main harness connects to the engine harness. Take it loose and flip the harness(chassis side) up side down and see if its rubbing the valve cover

 

[BigPapa]

Does the truck have an aft axle metal tank?

Scott