93' S10 2.8 stalls and backfires after warm up

[idiosamatik]

my 93 s10 is stalling & misfiring after reaching operating temp. I start the engine, Drive for about 10 minutes (the truck is running like a champ) then all of the sudden @#%$@. It starts to shutter and misfire(alot like i am running out of gas) this condition will remain until the engine is shut off & then cools.
When i restart the engine it runs fine again for 10 min. and starts all over again. PLEASE Help me.
I have replaced: Fuel pump, Fuel Filter, Spark plugs & wire, Dist.cap and rotor, MAP sensor, 02 sensor, PCV Valve, EGR valve and i Flushed the Radiatior, block, and heater coils. Still the problem remains. My diagnostic terminal reads a code 13 & 34 (MAP & O2) This has been reset after the repairs and i get no more codes. Any suggestion will be much appreciated.

[chevy3504]

it sounds like you ignition coil is bad ,bad coils fire fine when cold then arc out when they heat up its a cheap fix and should be replaced after 75,000 miles

[sreed25570]

also check to make sure you are not getting too much fuel (IE. bad pressure regulator) causing it to flood and die

[idiosamatik]

Thank you. I replaced the ignition coil and tightened the bolts that carry the injectors and it worked to stop the backfires. I've had a couple stalls since, but only at idle after driving. I noticed my timing was 14deg (instead of the factory 10deg.) tomorrow i will attempt to adjust it.