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First post hopefully i'm in the right area, i've seen alot of member's talking about starting issue's when hot, hope someone can help. So my 95 z28 lt1 starts perfect when the engine is cold, After a 30 min drive at normal speeds and a few alot faster.I parked and tried to restart. the engine just cranked over like normal, However it would'nt start up. i let it sit for 30 min and it fires right up
almost like a vapor lock. Anyone else run into this issue, i appreciate all input, thank ya'll
 

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I suspect a ICM failing, as when the Opti-Spark fails it's very final. Look for Vacuum leaks in the Intake (disassemble) hoses first, then swap the ICM, Ignition Control Module GM Genuine Parts 19352932 | eBay then drive it. If the Opti fails it will throw codes, and will likely not restart.
Please read my story. - So after a brief trip to store, on a very hot day my 94' Z28 Camaro stalled while rolling into my parking stall (lucky). I was very surprised since I only have 790 miles on a brand new 4l60E Barret Transmission, a new Summit Optispark, AC Delco H2O pump, OEM - Heater Core Assy. Hose, AC Compressor Kit, Drive belt and the Coil was replaced in 05'. So I waited a few minutes after popping the hood and got my new Actron Elite Auto-Scan Tool. Of course it started right up and idled normally. I could not pull a code for anything (I have done this before) no faults at all. I pulled the PCM Batt. Fuse for a minute returned it and continued with another Scan, and pulled no fault codes. I then drove car around my lot and let it idle for a while (15 minutes later) bringing car up to temp., and couldn't get it to do anything other than idle like a growling lion waiting for something to eat.
This car has never leaked a drop, and whenever I have a problem, I seem to remember finding a fault code for it. The only thing I can think of, is that I replaced the ICM in 2016, as it was failing when car was hot. That's a long time ago, so it seems now. The next day I tried to get a code show up, and "System Pass - No Faults Detected" was all I got. I went ahead and installed a new $123 AC Delco Ignition Control module anyways. While doing so I noticed the last mechanics working on my car let a small chunk of rubber from my cold air intake break off, near the throttle body. This would cause a vacuum leak stalling a car, and leaving No Error Code. I used a couple layers of electrical tape, to extend the CAI elbow, under the clamp at the TB, for now. The ICM install took about one hour, runs fine yaaa ! Update

09/01/2022 So I take a brief drive, and my car stalls out again after running on the freeway and stopping at the exit. It wouldn't start up hot, just crank. Fast forward to an hour later after the Tow back to home base, and it starts and runs normally again. My Scan Tool is not showing any codes, so it's back to disassembly, and hope it's just a vacuum leak. I just bought a Fuel Pump relay as they are cheap, that's going in next then a new Intake Elbow.
Automotive parking light Tire Wheel Car Vehicle
 

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So after replacing the ICM, the Coil (AC Delco), the Intake Elbow, the Fuel Pump Relay I had my Mechanic look at it. He said sparks can be seen at the Opti, so the Distributor has failed (No trouble codes !) at the Cap and Rotor. I bought a new NAPA (3 year Warranty) Distributor, and new Plugs and AC Delco (Insured) wires. The entire Ignition system is new now, and I have security of a Parts and Labor Warranty. The first 2 Opti's lasted over 10 years each, the Summit only 2 years, but I got that from eBay, so.
 
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