I have a 1993 s10 blazer 4x4 with a 4.3L vortech v6.the problem is the vehicle will start and run 5-20 minutes and dies and wont restart for several hours or days it will spin over and will not even try to start.there are no trouble codes stored in computer.fuel pressure is a steady 56 lbs ( which is high enough for vehicle to run because i have a 92 s10 blazer with the same injection system and it runs at 52 lbs just fine).i have replaced fuel pump,filter,cpi unit,ecm unit ,coil,ignition module,distributor cap,rotor,plug wires and checked all the fuses all with the same result.when engine does run it sputters and misses but not badly .i did have a trouble code one time for the egr and iac valves but it cleared and has not returned.parts are getting expensive what am i missing?
