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.
Yes. A sticking fuel injector can allow far too much fuel into a cylinder.
see link below for help Good Luck