hello i have a 1993 s-10 blazer with the 4.3 cpi that was sitting up for a couple of years i have replaced the fuel pump and filter and the nut kit as one of the lines was leaking.still didnt fix the problem it has a rough idol now power. i have replaced all the sensors distributor and a full tune up and still runs the same way and it is fouling the plugs on 3 and 5 i have done a compression and the cylinders is fine as the fuel pressure and not showing any codes .has anybody else had this problem

 

Replace the CPI and ensure the nut kit is properly installed