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Pull the fault codes in the ECM to see what is causing the problem, It WILL be found in the error code. Does the engine do this when driving down the highway or only when moving slowly or stopped.? An 'oxygen sensor malfunction will NOT cause the engine to stop. Next place to look is the crankshaft position sensor.
It could be a number of things--from a failing fuel pump to a failing ignition component, PULL the FAULT CODE. Don't guess.
When a catalytic converter is coming apart on the inside, it can restrict air flow and power, and it usually happens or gets worse when the vehicle has been running long enough to generate a lot of heat. Once it cools down, the symptoms can completely go away until you begin to drive it again. It's one possibility.
Sounds like you may have busted your Serpentine belt. The serpentine belt runs your water pump, alt, and ac. You can pick up an serpentine belt for about $35 at almost any auto parts store
I would check sparkplugs, plug wires, vacuum hoses to map sensor, check to see if exhaust is strong out pipe, may be a catalytic convertor stopped up , bad O2 sensor will cause starting and idling problems.
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