Engine hard to start when hot

[sunshadowGT]

I have this weird problem where if I drive my stang for a bout 10 min or more, then park it and turn off the engine for about 10 minutes, the engine won't start. I get no spark. The fuel pump comes on, and I get pressure. If I let it sit for about 2.5 hours, then it will start.

To try to resolve this problem I have:
replaced the ICM 3 times
replaced the fuel pump twice
replaced the fuel filter twice
replaced the distributor
replaced the battery
replaced the ignition coil twice
replaced the constant control relay module
replaced the coolant temp sensor
flushed the coolant system twice
replaced the ignition switch
disconnected the alarm system

Does anyone have any ideas? I've spent a lot of time and money trying to fix this problem and I can't seem to knock it out.

Thanks in advance for your help!

 

[stang_gt_1994]

I would see if you have any opens in wires that deal with spark control. Get a DMM and start ohm'ing wires out.