86 s10 blazer 2.8L

Blazer sat for ten years. put new battery in it, add fuel and fuel treatment. it started right up. running rough. at this time it will run fine until it reaches operating temp. then it starts to die when you come to a stop. it starts back up and drive most of the time. sometimes hafto tap gas to get it going. i have changed the following parts...fuel pump.fuel filter.fuel reg.throttle position sensor. idle air motor twice.igition coil. plugs. wires.spark control module.map sensor.temp sensor.oil presuresensor. broken vac hoses. Im at aloss here. i cant stop pulling my hair out. could it be the ecm malfuntioning intermit...? help.....

check the fuel pressure and make sure it holds pressure in specks when key is turned off.

If it wasnt holding pressure after off it wouldnt start up and run perfectly fine until it reaches operating temp

Have changed everything but the knock sensor and ecm. still after it gets to operating yemp it idles really low and check gauges light comes on. can pump the gas four times and kill it. never seen a truck do this before.:mad: