a bad camshaft sensor will do this. considering it is tuned up properly...
fuel systemfor 1998 chevy malibu
In the fuel tank.
Where is the fuel filter located on a 1998 Chevy Malibu?"
the fuel filter is in back just ahead of fuel tank.
Put a fuel pressure gauge on it and that will tell you.
GM vehicles do not have a fuel pump inertia switch.
bad piston rings.
too much fuel, excessive oil consumption
on the 3.1 they are under the plenum on top of engine.
check your fuel pressure.
see link below for help Good Luck
Yes. A sticking fuel injector can allow far too much fuel into a cylinder.