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When was last "healthy" tune up? Plugs, wires, ALL filters including FUEL filter? I'd start there, and run a good fuel system cleaner w/next tank full of fuel. In winter, with fluctuating temps, condensation (water) forms in fuel tank and spark plugs don't burn fuel/water efficiently causing stumbling and premature wear on your plugs.
It is most likely a sensor. It is common in these. You may check them with an ohmmeter. You may also test relays the same way.
A vehicle needs gas and spark to run. One of them is not getting to motor. You can check fuel pressure on test port on fuel rail for fuel. You can pull off a spark plug, plug it back into wire, lay it on top of motor, have someone else crank, while you watch for spark, Put back in, move to next plug wire.
first sounds like a stopped up fuel filter, and when you say tune up was it plugs wires and not coil ? if it had a missfire for a time it could have ruined the cat but i bet its the fuel filter if it hasnt been replaced.
there is a special tool for this job but I have cheated on this but you ned to be careful when doing this.The wishbone shaped mount on the front going from motor to front of vehicle, remove and it allows the motor to tilt.
Look for a bad coil pack. If you have the bank of three coils on the front passenger side of the motor, it is possible that one of them is going bad. This can be an intermittent problem since it failure is frequently heat related, and may not show up until the car is all heated up. It is simple enough to change one of these if you can figure out which one it is. There is a little device ( Spark detector) that can sense the sparks inside the wires. Get one and hold it close to each wire... away from the coils. The wire, that does not make the spark detector light up...is coming from the bad coil. (It is also possible that a spark plug wire is bad instead.) Good luck. Chip