1994 CHEVROLET S SERIES Fuel System Otherdelivery Problems

I OWN A 1994 CHEVROLET S-10 WITH A 4.3L V-6 ENGINE WHICH I PURCHASED NEW.. IT CURRENTLY HAS APPROXIMATELY 88,000 MILES ON THE ODOMETER. FOR SEVERAL YEARS NOW THIS TRUCK HAD AN IDLE LOPE AND MISS WHICH I HAVE BEEN UNABLE TO CORRECT. I HAVE CHANGED THE SPARK PLUGS AND WIRES SEVERAL TIMES. I HAVE REPLACED THE THROTTLE POSITION SENSOR, MANIFOLD ABSOLUTE PRESSURE SENSORS, FUEL INJECTOR, FUEL REGULATOR, AND ALL ASSOCIATED HARDWARE THAT SHOULD BE REPLACED AS A UNIT ON THAT MODEL AND FUEL SYSTEM. THE EGR SYSTEM HAS BEEN SERVICED UNDER RECALL. UP TO THIS POINT THERE HAVE BEEN NO SERIOUS DRIVEABILITY PROBLEMS. THE ONLY INDICATION OF A PROBLEM HAS BEEN THAT THE "CHECK GUAGES" INDICATOR WOULD BRIEFLY LIGHT UP UNDER SUDDEN DECELERATION. THE "CHECK ENGINE" LIGHT HAS NEVER LIT TO MY KNOWLEDGE, NOR HAVE I BEEN ABLE TO RECOVER A CPU FAULT CODE USING PUBLISHED PROCEDURES. THAT IS...

MY TRUCK FOR SEVERAL YEARS NOW HAS HAD AN IDLE LOPE AND MISS WHICH I HAVE BEEN UNABLE TO CORRECT. I HAVE CHANGED THE SPARK PLUGS AND SPARK PLUG WIRES SEVERAL TIMES. I HAVE REPLACED THE THROTTLE POSITION SENSOR AND THE MANIFOLD ABSOLUTE PRESSURE SENSOR. ALSO ,REPLACED THE FUEL INJECTOR, FUEL PRESSURE REGULATOR, AND ALL ASSOCIATED HARDWARE THAT IS TO BE REPLACED AS A UNIT ON THAT MODEL OF VEHICLE. THE EGR SYSTEM HAS BEEN REPLACED UNDER RECALL. UP TO THIS POINT THERE HAVE BEEN NO SERIOUS STARTING PROBLEMS. THE ONLY INDICATION OF A PROBLEM HAS BEEN THAT THE ENGINE CHECK INDICATOR WOULD BRIEFLY LIGHT UP UNDER SUDDEN DECELERATION. THE ENGINE CHECK ENGINE" LIGHT HAS NEVER BEEN LIT TO MY KNOWLEDGE, NOR HAVE I BEEN ABLE TO RECOVER A CPU FAULT CODE USING PUBLISHED PROCEDURES. THAT IS PART OF WHAT HAS BEEN SO MADDENING ABOUT THIS PROBLEM--VEHICLE DIAGNOSTICS ARE NOT...