91 buick century jerking/overloading gas help!!

:banghead: I have a 91 buick. It has been acting up bad, first wouldnt run good at all changed catylitic conv, O2 sensor, MAF sensor the sensor right below that too. It is jerking when going down road and when you first start it and it is cold it will run for 2 or 3 min fine then when you take off you push gas down it sludges out then back off and it starts to go then when you get speed up a little it jerks. then go up hill and it runs like a charm. need this car bad to get back and forth to school!! please help my dad and I are running out of ideas but could it be the fuel pressure regulator? when I bought the car it had sat for a couple of years.

heres a few ideas from previous problems like yours
my experience with my century ended up being i need to spray some carb cleaner into the screen under the cold air intake(the black hose thing) cause that came off and wasnt on for months and all types of gunk was stuck in there.

also heres some stuff hope it helps

Ignition Module Replaced
Mass Air Flow Sensor Inspected
Idle Air Control Valve Inspected
Fuel Pressure Regulator Replaced -
Numerous Vacuum Hoses/Connections Replaced -
Fuel Filter Replaced -
Numerous Engine Electrical Connectors Inspected Fuel Pump Circuit Voltage Drop (6v)
Fuel Injector Impedance