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I having problems with my 07 that randomly shuts off. It sometimes goes a couple of day or even a week or so before it decides to shut off. It does it driving down the road and even at idle. Thought it was the lift pump so I sent it to fass. They said there was nothing wrong with it. So I took...

I have got a 07 cummins with twin turbos, twin cp3's, airdog 160, electric water pump, built 48re, 120hp tips. I am having problem with the rail pressure surging on the truck. when you take off from the light it starts surging after 1/4 of throttle. Rail pressure fluctuates 5,000 to 10,000 psi...