93 blazer is dead i need help!

ok im tired of beating my head against a wall on this one..i bought a 93 s10 blazer that ran fine untill lately. it did have the SES light on. i had it checked and it was the knock sensor. but as i said it ran fine. i found out that the 4.3 vortec was from a 1991 blazer. i was driving and it acted like it ran out of fuel. and would not start for an hour. then it started right up but was running rough. so i changed the fuel pump and filter. after it started and idled fine but would miss out until about 25 mph then it ran fine. then about 2 hours later it died and wont start. ive checked the coil and it has spark. i have not checked the fuel pressure on a gauge but there is fuel at the injecters. i want to exaust all options before taking it to a shop for a knock sensor. any ideas would be great.

When it quits check for lose of fuel pressure or spark to plugs.
Fuel pressure specs is 9-13 lbs of pressure.

MT his 93 may be like my old 93 was, CPI so it would need 55-60 lbs if that is the case. If his is TB unit then you would be right. Most 93s were CPI. A problem too. Invest in a fuel pressure guage, a service manual, and if fuel is OK then have the igniton module(in distributor) checked. Might be failing when heated up.

MT his 93 may be like my old 93 was, CPI so it would need 55-60 lbs if that is the case. If his is TB unit then you would be right. Most 93s were CPI. A problem too. Invest in a fuel pressure guage, a service manual, and if fuel is OK then have the igniton module(in distributor) checked. Might be failing when heated up.

Yes it could be.
No engine code given and he said it was from a 91.
I was going by what he said on seeing fuel at injectors for TB injecton..