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I have an '01 extended cab with the 4.8 and am having similar problems. The dealer flushed the fuel system and cleaned the throttle body for 200 big ones, but that did not solve the problem.
There are numerous possibilities, but the dealer can't figure it out because it is not producing any codes. Have you removed the air tube and cleaned the throttle body yet? This has worked for some and is referred to in at least one TSB (see replies to my post below). If that doesn't work, check the fuel pressure regulator for any gas dripping from the vacuum tube attached to it. It must be replaced if gas is dripping.
The dealer has offered to replace my throttle body tomorrow for a very reasonable price, but there is no guarantee that the problem will be solved. It's frustrating when the dealer can't diagnose and fix the problem. Keep us posted on your efforts and results, and use the search feature on this site to peruse other posts about similar problems.
Good Luck!
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