Check your plugs, what shape are they in. Also, does the car idle ok? Could be a bad map sensor or bad wire. I had a wire break on my map sensor harness a week ago-made the car run like shit. Are you getting a CEL? Try disconnecting your battery and resetting the ecu, its worth a shot. I guess a few other things to try would be replacing your pcv valve (obd2 is on top the vc, obd1 on backside of block), change your fuel filter, change your plugs if they are bad, replace your plug wires, replace your distcap and rotor, check your ign coil. It's just odd that the car ran fine before you changed the vc gasket and now it sputters.