Hello everyone, this is my first post on here and looking for help. My truck is driving me crazy and my wife is going to kill me if this continues, i just spent $6600 on it and still has issues. So......here is the problem

07 6.0l 300,000kms standard transmission 4x4 reg cab dually

sputterers and when it does it, it blows blue smoke. Only sputters between 2000-2500 rpm. If you mash on it it pulls thru it with only a little sputter and goes like hell. Really bad in 1st and 2nd gear, then when cruising at 100km (5th gear) it starts again. Heres what Ive done,

Took it to Ford and did contribution test, # 2 was bad rest were perfect.They said everything else was great. Bought injector and changed it, next day hpop went and thats when it got expensive. New pump, all sensors for oil system, egr delete, mbrp exhaust, batteries, turbo and pick up tubes. Took back to Ford to test for same sputter and nothing has changed, still # 2 is bad even with new injector. They tested ficm (good) pcm (good) and they said all is good. WHAT DO I DO NOW?, I NEED HELP. A friend put his bully dog on it and it seams a bit better so what ever that means. Looking for ideas. Thanks in advance

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Never have I had a code on this truck, I have egr delete so no egr issues, turbo works amazing lots of boost. There isn't a cat and it seams to breath healthy, whistles like hell out exhaust( I like that) just that sputter at certain revs and blue smoke, once you power thru that sputter it has tons of power, will brake loose on traction (dually) in third and pulls like hell. Not disappointed at all with the power after it gets through that sputter. Lots of people are saying check the harness so that will be next on the list