Q: P0300 P0301 P0303. Loss of power, high fuel consumption, rough idle. New plugs, coils, and wires.
Initially with the loss of power I got code P0304 replaced my spark plugs and codes cleared. Seemed to regain power. I was on the highway 1-2 weeks later going up a very steep hill. Engine lost significant power, check engine light flashed for a minute. Couldn't go over 50 (without shaking and major strain on the engine)from there on out. Once I made it to an exit my car stalled at the stop sign. Started again no problem. Codes P0301 P0303. I installed new coils and wires. Checked codes once more and P0300 was added. No issues starting. Has only stalled once. Check engine light tends to flash when at high speeds or steep hills.
My car has 199000 miles.
My car has an automatic transmission.
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