Similar problem on my 4.3 GXI-E. Cold start perfect and then runs perfectly, but after sitting for 15 min with a hot engine I need to throttle all the way up to get the engine to catch. A strong smell of gas. Plugs smell like gas and were fouled. The mechanic thought the injectors were leaking down (rail was losing pressure) and said that the excessive throttle needed to start was burning off the excess fuel in the cylinder from a leaky injector (s). So I replaced the injectors, replaced, the temp. sensor, cap, rotor, wires, plugs, TPS etc. All with no results. The engine starts right up when cold and runs strong, just the problem with the hot restart. Diving me nuts! Only thing I can think io of is that I got a bad injector that is still leaking down in the new lot I bought.
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