Make sure that you don't have a fuel delivery problem. Your fuel
pressure could be low (pump or fuel regulator) or your fuel filter may
be clogged.

Make sure your injectors are all operating. Start the car. Get a thin
stick or bent wire hanger. Make a fist and put the thin stick in your
fist. Put the other side on each injector -- you should be able to hear
the clicking under most circumstances.

Check your plugs and wires -- make sure they are all in good order.

Also check inside your distributor and make sure there's no oil in it.

the inside of them. You will need a new/rebuilt distributor in that
case.

is your check engine light on?

could also be a lazy oxygen sensor.