I Have a CYL sensor error on my 1991 accord, I tested for resistance and it was in specification 391 (250-500 Ohms) and there's no ground to each pin in the ignition harness connectors either, any ideas as to what else may cause this?

The internal distributor sensors (CKP, CYL, and TDC) are not serviceable. You'll need to install a new distributor housing (genuine Honda only). Over 50% of new aftermarket distributors for Hondas, at AMHD, don't work.

Dang! I was hoping it wouldn't come to this.