O2 sensor don't kill the engine. Lower gas mileage, yes. You don't enough info, like how long it takes or how far and how fast. I would be looking at the fuel side. Replace the fuel filter first. Cheap fix. Just a note. Clogged fuel filters usually take out the fuel pump also.
Testimonial: "The truck does not start at all it tries, then it shutters and nothing, sort of dieseling."
Check how hot it is getting. Dieseling on gas engines is from overheating.
it not hot at all, it will not start.
Lots of black smoke out the exhaust? Replace the engine coolant temperature(ECT) sensor. Older GM's like in the 90's were real susceptible to ECM dumping fuel for bad ECT sensors. The ECM would read the ECT at -40 degrees. And dump lots of fuel in. A scanner will tell you right off. If this is the problem, replace the ECT and you should change the spark plugs also, they are gas fouled out. A cold start and dieseling does happen unless there is way to much fuel. It will have the black smoke or a real strong smell of fuel at the tail pipe.
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Sometimes o2 sensors can block the engine. It may have triggered the fuel cutoff. Check your manual for location of the cutoff switch and try to reset it. It may keep it going long enough to get sensor replaced or at least checked out.
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