1997 B3500 5.2 dies once warm

My 1997 Dodge B3500 with the 5.2 starts and runs great cold and has run great for years but one day about a week ago once at running temp it dies and it is a real bitch to get restarted. It spits sputters and belches smoke and stumbles back to running as long as I keep my foot on the gas enough. I can smell gas when it restarts. If and when it idles once warm you put it in gear and it dies instantly. I replaced the usual culprits the TPS, IAC, I swapped relays because online a guy said if the relay is bad the IAC may not work or not work right and his relay swap solved his problem. The parts swapped seem to make it run better cold but once warm it is a real nightmare. I took my van to Advance and scanned it but no codes found. Anyone else had and solved this problem?

1. Check the fuel pressure.
2. If the FP checks out good then it could be time for a replacement PCM.