chevy lumina 1997

My Lumina 1997, V6 3.1 148k miles surging or shaking while idle and sometime engine stop. Also with shift in parking at high revolution start voilent jerk and failing engine, this problem is present all time. When engine stop running or problem happens the only way to get away of the problem is pushing the gas pedal at high revolution for about 5 to 10 seconds, at the begining goes slow and do not respond to the aceleration and them start to respond ok. I have recently changed spark plugs, wires, crankshaft position sensor, air filter, and fuel filter. This Lumina never has a problem sinse I bought it in 2003.
I will appreciate your help because I dont want expensive repairing.