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Brook T

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  1. Hello everyone I hope someone can help me on this problem. I have a 2008 chu613 ser 1m1an07y18n002436. The truck was running fine with no issues or complaints. Then the truck shows up back at the shop with low power. I took it for a test drive and sure enough its a sick dog. Running like its missing on more than one cyl and wont even spin a tire. We changed the fuel filters and it still ran like crap. I parked it for the night and came back to it the next morning. I took it for another test and it ran great and didn't skip a beat.........until about three miles later it was like someone flipped a switch and it ran like crap again. No codes. Running again like its on 3 or 4 cyl. Checked the fuel lines for air leaks and did not find a prob. Took off fuel lines at ecm and there was no blockage or restriction. Fuel system appears to be good. Parked truck again over night and same thing the next morning. Ran liked a raped ape for 3 miles or so and then fell on its face again. What am I missing here. boost pressure is between 30-35 when running great boost pressure is 20-22 when running poor thanks in advance everyone!!!!
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