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While running, unplug each spark plug wire and see if the sound of the engine doesn't change on any. Repeat test on injectors. If no sound change, that cylinder is not firing. This can identify a bad coil, distributor / cap / rotor, or stuck injector.
Gas in oil could be from a stuck injector or leaking injector o-ring which allows the fuel rail to drain out in the cylinder, then it seeps past the rings into the bottom of the engine. Gas dilutes oil and leads to a spun bearing so stay on top of it and change the oil if it smells like gas.
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