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Changed fuel filter but still not working

Hey guys I was driving today in my corolla and the power I was getting just suddenly dropped to the point I could barely get up hills… changed the fuel filter and it’s still the same. Any ideas what it might be?

Check the fuel pressure.

Tester

Automatic or stick shift . . . ?!

Has the check engine light been on and/or flashing . . . ?!

It’s stick shift and no strange lights have been flashing either… a bit of black smoke from the exhaust too

An exhaust restriction could do this too. Maybe a chunk of your catalytic converter or muffler came loose.

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Have you looked at your air filter lately?