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My 92′ Olds with a 3.1 v-6 starts and runs fine for a few seconds, then it hesitates, misses, gets worse then dies.

I replaced :

Fuel Filter, Fuel Pump, Removed and cleaned all carbon from EGR and replaced it, separated exhaust from catalytic converter,

and installed a new Crank Position Sensor. I fired it up and same thin still happens! Is it possible timing chain/belt? (does backfire at higher rpm before stalling). Could it be a Cam sensor? or can a faulty coil pack be the culprit? how can I test and eliminate these possibilities? or is there something I may have missed?

i got a 98 chevy s1 blazer 4×4 4.3L V6 and while i was driving when i would give it more gas it would start bogging down like it wasnt getting any gas to the egine then it drove fine for a few more blocks and started doing it again and then it died. Fuel pump maybe?

I have a 03 Chevy Blazer 4.3L Vortech 4X4 automatic. It has just recently strated to idle rough and has died on me twice now. There are no warning light on either. Any ideas?