1992 Toyota Camry No start only when hot.

Car runs fine, drives fine, no codes, idle normal. Starts fine in the morning every time. After the car has been driven and I try to start it again while it is still warm, it will crank but will not start unless I hold the gas pedal all the way down as I turn the key. This way it always starts from the first crank every single time. Any ideas? I have replaced the plugs and wires because it was due to a tune-up anyway which did not change the condition. Thanks in advance. Alex.