2002 Buick car problems

I own a 2002 Buick Park Avenue and it has been giving me some trouble lately. At randoms times, usually when I am driving on back roads the car does something very weird. The car will start to jerk while accelerating, the RPM meter will go to zero, the power steering will go out, and the car will eventually stall. I have tried a few different things by replacing the catalytic converter along with the fuel tank and I continue to have the same problem at random times. If anybody has any idea what might need repaired please let me know.

Did you mean replace fuel pump, not fuel tank?

yeah the fuel tank my fault

This sounds electrical. Check the battery connections. Make sure there aren’t any loose wires into the fusebox by the battery.