Originally Posted by
c_kasson@yahoo.com
Twice went to car show with 2005 srt6 runs fine going set at show 3 to 5 hours with hood open Go to leave engine starts, stumbles and shuts off like out of gas. It will not restart for several hours The next morning starts and runs fine. This has happened twice any suggestions I am afraid of getting stranded with this car. Vapor lock??????
Ok, just saw this.
When it stumbles and stalls, does the starter spin the engine over? If so, it's not likely the RCM.
I also saw your fuel pressure was 40 - not a good sign. Spec is 54-60psi with engine RUNNING. You should hold 36 PSI or more for 30 minutes, if not, you have an injector, pump or something not right.
An injector that leaks into a cylinder will cause misfires on startup.
My numbers here are not guesses, they are out of the service manual. If you can't get 54-60psi with the engine running, you need a pump and/or a filter/regulator. That is, if you have a new RCM. The pump relay on the RCM can go bad, but a new RCM rules this out.