I own a 1993 Camaro 3.4 that I have had since 2002.It has 236k on it.I have maintained it well and have done oil changes at regular 3,000-5,000 miles faithfully.Presently it will start and idle perfectly but once it reaches normal
operating temp. it sputters,backfires and stalls.It will not start again until it cools down.I have been through the fuel delivery system and everything is fine and the vacuum system.Same deal there.It is not overheating.Replaced the EGR valve and no results.I did check compression and #4 cylinder is checking at 40 psi compared to 120 psi to the other 5 cylinders but it doesn't make sense to me that it is acting like this with only one cylinder low.Somebody please help.

 

double check your compression to confirm. if confirmed it could be bad valve or blown head gasket.