Quote Originally Posted by The Slug View Post
Now about this miss fire....?

Well if you had used a 166 with an OBD socket, I could have plugged in and told you in a few mins !!!!.

But from what you describe as being like the ignition being switched off and on intermittently and the rev counter dropping to zero and back. I would only guess either interupted power supply to and from ECU to sensors or Crank sensor (may need removing and cleaning metal filings from end) + check sensor to ECU wiring.Also check ECU earths (all of them).

But that's a hard one to diagnose at distance.

P.S.
I hate putting this in writing as it may come round and bite me in the bum if its something else totally