you have to jumper the service connector before
you try to adjust the timing manually. Its a
2 wire harness located by the ECU in the passenger
side kick panel. Use a paper clip to connect the
2 wires. Start the car, allow to get warm,
and adjust the timing.

I am assuming you are using a timing light?
pretty tough to do this job accurately without
one.

If you can't adjust it enough to get it right,
then you are off by a tooth, probably on the
cam.

t