'01 Tacoma 3.4L; intermittent hard starting problem only when engine is warm.?

At 40k, the dealer replaced an idle air control valve because of the same problem, but it was also accompanied at that time by a warm engine stall problem; if I was at idle when the engine was at temp, sometimes it would stall. It was still under emissions warranty then, so they split cost with me and everything was fine until now; the hard start problem is back. This never happens when it is cold, but after I drive it, shut it off, and restart it, it tries to start but it's like it's having trouble getting fuel or something. If I add accelerator, usually it will start. (this is still an intermittent problem, sometimes it starts fine warm. The stalling problem has not returned, it idles fine. I changed plugs 2 weeks ago. No "check engine" light has ever come on. I hope someone can help me. I have never heard of changing an idle control motor twice in 80k miles (I have about 82K now) Thanks.