GMC S15 ENGINE

I've Changed The O2 Sensor Like 5 Times And The Same One Keeps Going Bad And When It Gose Bad It Missfires And Runs To Lean And Low Volteg...

I Have A 1990 Gmc S15 Pickup And It Seems To Be In Very Good Condition. I Recently Had The O2 Censor Replaced Because I Had A Check Ingine...

I Was Rearended And The Truck Stalled, Now It Cranks But Will Not Start.

Stalls While Driving And Then Won't Start. Fuel Pump?