Problem with a 1991 chevy truck 350 tbi, ok when it warms up a little it will die, at every stop sign or at idle I have had it at two mechanic and they can't figure it out either they both hooked up their scanners up to it but no codes show except for egr because it off have a plate on hole. Here are the items I have replaced so far the pickup coil in distributor, distributor cap and rotor,module, oxygen sensor, tps sensor, fuel pump pressure switch, temperature switch,spark plugs,tryed a different throttle body did the same thing. Changed out ECM also check fuel pressure around 14.Tryed a different coil, knocks sensor, map sensor, new gasket on throttle body changed out intake gasket. If anyone else every had the same problem please let me know I AM STUMPED. The truck does have a few miles on it 314000 but still runs good once you get going also if you floor it will drop down like nothing there but then take off like a bat out of hell, every time you let off the gas it will do the same thing.