I have a 91 s-10 blazer that starts but immediately stalls. Last fall I gave it a full tune up including fuel filter,spark plugs,air cleaner,spark plug wires,cap&rotor. Just recently it has been missing espically on the high way. I pulled the egr valve and cleaned the carbon deposits(there were a lot). It seemed to run a little better, but completley. Now when I go to start it, it stalls after 3 seconds or more. I have spark, i've checked fuel pressure, tested the coil, check spark plugs, check cap and rotor, installed a new pcv valve, tried premium gas and nothing is working. any suggestions I would greatly apprecitate it. thanx

 

Ihad fuel pressure, but not enough. It was the fuel pump.