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1999 hummer h1 with a 6.5 turbo deisel

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i have a 1999 hummer h1 with a 6.5 turbo deisel purchaseed from the USA it has 40 x 15.5 tires and i find that it chugs going up a hill what could it be
Submitted: 6 years ago.
Category: Car
Expert:  Car expert replied 6 years ago.
Welcome to just I'm here to help you and your 100% satisfaction is my goal.Very often this is caused by a faulty vacuum pump or broken vacuum line or faulty waste gate vacuum solenoid . Check for vacuum at the wastegate solenoid, should have at least 20".Check for vacuum out of solenoid at idle. Check for vacuum hose restriction between wastegate solenoid and wastegate actuator
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