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What would cause a 1998 subaru outback to barely run with the gas throttle fully pushed?

- Insufficient fuel supply: Check fuel pressure and fuel filter

- Faulty fuel pump

- Clogged fuel injector

- Vacuum leak

- Faulty Mass Air Flow (MAF) sensor

- Faulty Oxygen sensor

- Issues with the ignition system (spark plugs, spark plug wires, ignition coil, etc.)

- Faulty Engine Coolant Temperature sensor (ECT)

- Transmission issues (slipping transmission, low transmission fluid, etc.)