Ive just had the turbo gone through, injectors tested, bulletproof egr and a new egr valve put on my truck and i am waiting on my new ficm. The diesel shop put a ficm on to get my by until mine comes in but it only tested at 44v. Truck starts ok and runs fine then out of no where around 55-60mph will start to buck until I let out of the throttle. Any thoughts? Trucks a 2004 6.0 with 156xxx

 

Bad ficm. Hav dealer put dif one on. SHOULD solve this.