1989 Cadillac DeVille - can’t get full power

Cant get full power, feels like i am running out of gas even with full tank.

Plethora of possible problems.

A bad fuel pump comes to mind but you really need someone with hands on the car.

A clogged catalytic converter can cause lack of power problems. That can be easily diagnosed with a vacuum gauge if you can find someone who knows how to read it for a clog as there can be 2 symptoms.

Worn out engine, filthy air filter, or slippage in the transmission can also cause this kind of problem. It’s going to take hands on and a diagnosis as at 32 years old anything is possible; or even a combination of anythings.

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