Q: Car still runs bad. Replaced fuel and oil filter. Also replaced knock sensor and got an oil change. Car stalls and has slow speed.

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I was getting the P0172 and P0171 codes when I got a diagnostic. I got the sparkplugs changed and it ran a little better. I got the fuel filter changed and the oil filter changed and it ran a little better. Then I got the knock sensor changed and it ran a little better. It still stalls and runs slow. It is also slow to accelerate. What else can be the problem? Could you provide a list of possible fixes to this problem?

My car has 204000 miles.
My car has an automatic transmission.

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