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might be worth starting with a wiggle test if you don't have access to any diagnostics. engine running and as suggested, careful of moving parts just go round the engine bay giving the loom/wiring a wiggle to see if you can re-create the fault. Jon
I would need more information to give you a good answer. I need to know how long will it stay running a few seconds an hour what is it. I had a 2000 blazer that would start fine everyday and i would 10 minutes and it died sometimes i drove an hour and it died. I parked it and everytime i started it would run about 10-15 minutes and die. after it would die i would check fuel pressure which was good and spark. Well turns out there's no spark so i changed coil ,plugs, wires, rotor. I finally changed the crankshaft positioning sensor and that tuned out to be the problem so good luck.
If you are driving the car and it wont start after driving awhile. Do a wiggle on the CKP (crank position sensor) this sensor is located at the front main engine pulley, I am seeing a lot of loose male to female connection shut car off.
The ck engine light should not be ignored, what sensor was shown to be bad ? Have it scanned again and replace the sensor that is bad if it still runs rough you might want to consider a tune up. Plugs, wires, fuel and air filter's and clean the throttle body with some gumout. It could also be the IAC motor Idle Air Control. Good Luck