When i try to accelerate quick the car seems not get enough gas slowly it seems to work fine on a 2003 buick regal

Possible vacuum leak.

If you're having issues during hard acceleration and that's when the engine light starts to flash, especially in high mileage cars...it is more than likely a bad catalytic converter. The engine light will flash for misfires too but that is usually a consistent problem from start-up. A catalytic converter's internals break down over time. Poor gas quality accelerates this or high water content in the gas. Water is acatalytic converter's worse enemy.
Cutting the converter out is not an option on these GM motors as they have O2 sensor(s) on and\or around them...and you don't want to "confuse" the engine's computer (ECU).
They should cost around $250 to have replaced by a local muffler shop and they'll keep the old one as a trade in because they have valuable metals inside them. This helps offset the cost of the repair. The good news is that after it's replaced, your car's engine will be revamped with restored horsepower.