Lean Fuel Mixture on 1995 Ford Thunderbird can I manually adjust Air/Fuel Mix?

I have a 1995 Ford Thunderbird - it has 82k miles.

I recently started to experience a lack of power when I try to accelerate from stop (for instance when I hit the gas at a stop light, the car seems to lack accelerating power).

I purchased an inexpensive Engine Code reader and it gives me the code for Lean Fuel Mixture. (That was the only fault it gave. Tested it a few times).

I checked the spark plugs - they all have a chalky white appearance. Would this confirm lean fuel mixture?

I have since replaced the Spark Plugs, distributor cap and distributor rotor.

The Fuel Filter was replaced 3 years ago. Do you think I should replace that also.

First does this sound like a a Lean Fuel mixture problem from what I described above?

Suspecting it is a Lean Fuel mixture (the engine code reader said it is so I only assume that's true) - Anyhow if it is a lean fuel mixture can I manually adjust the air/fuel mixture? I recall that it used to be possible on old cars to do so, but I do not know how to do so on Fuel Injected engines?

Any other advice on what to test, check, or replace?

I appreciate any help and advice, I literally have no one to ask for help in this matter.

Thanks alot in advance.

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