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Update. I did run the truck on the road. Up hills and on the highway to 65. I have 4:10 gears. As best as I can tell with the gauge I have I am doing about 10lb of boost.

oh and I checked on the fuel shut off. It is pulled fully upward. so its good

ok finally got a chance to work on truck.....In the process of installing a boost gauge we found a small leak just below the turbo. We fixed that. We installed a tube that goes into the cab to read boost. In the process, we started the truck with the air horn off. Plenty of air flow but hard to...

Thanks for all the replies. So what I am gathering is to first check that I have no boost air leaks and eliminate that possibility. What about the diaphragm on the waste gate area of the turbo? Does it fail? What does it do? Do I need to check that? I guess I need to get one of those hose...

Sorry I did not read your complete reply, got a distraction. I replaced the shut off a couple of years ago. I checked it a couple of weeks ago. It is going all the way up after bumping the starter. boot is good.

I have done that...and thanks for your reply

I apologize for such a long post. I guess I need to explain. Bought the truck 5 years ago. Daily driver. Had very few problems. Truck isstock except for plate slid forward and BHAF. 4:10 gears. Truck starts and runs good. Last year bought an RV. 8400lbs empty. Pulled local, noproblems. Truck...