Okay. After 4 Fuel pumps replaced, a month later Today, About 1 minute after driving, the service engine light comes on, then as i am traveling, I hear a clunk, as well as loss of oil pressure. I realize as I head up hill, after I reach the top, it does this again, almost like the Thump you hear when you are switching over to 4x while driving, but not that extreme. Just a clunk like the motor shifted. I notice my oil pressure is at 40, instead of the usual 60 psi. After 5 clunks, and 30 minutes of driving to work, I let my blazer cool down, and check the oil. Oil level is fine. Restart, and it dies. Restart, and it holds with a surge in rpms, then back down.Very shaky weakness felt. Not the strong vehicle it was. Is this the OIL PUMP, and if so where is this located? Is it maybe a sensor? It's a 1996 Chevy BlazerLT 4x4, T10 model with 4.3L v6 4 door. Someone please help me diagnose this out.

Thanks in advance, I'm sitting here waiting.

 

Sounds more like you are having spark problems. Get the codes pulled. I just wnet throught something similar, look for a thread called "P0300multiple misfires".

Ran real rough at low rpms and smoothed out some at higher rpms. but never had any real power. I had a dead miss on 2 pistons.