Recon,

I have been unable to locate individual parts for 4g64 2gen distributor.

After tearing down a couple of these, the screws that hold the harness plug
to the dist body are installed with RED loctite so heat & care must be used on teardown.

I personally would recommend a " rebuilt " unit complete as the optical sensors could be dirty
but the sensors are so robust that the dist bowl would have to be wet with oil/contaminant
for a no-sync condition to exist ( which could cause your issue).

These optical sensors are VERY stout and seldom fail.

So the % are with you to get a good sensor with a reman dist.

~claych