Quote:
Originally Posted by Vegas69
I'd put my money on a sticky relief valve. Fix it before you ruin the engine.
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Bingo. Many(6 in 3 mos time) of these came into the dealership I worked at. All high mile rigs. My own truck has 178k on it now and has not done that yet, but I almost expect it to. The 5.3s are great, I love mine. If you take care of it soon you should get a lot more miles out of it.
