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You checked for a chipped intake valve?
Fire the truck up and let it warm up. While the engine is sitting at an idle, hold a dollar bill over the opening at the end of your exhaust. The 'wind' blowing out of your pipe(s) should blow the bill out, however,a chipped valve will try to momentarily (and repetitively) suck it into the pipe.
A compression test would do it too, but the cash test is quick, neat to see...in a heart sinking sorta way...and the tool only costs you a buck.
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