Ihave a 1983 Morgan 4/4 fitted with a CVH engine, its not running too good at the moment, if I go down a road where the speed limit is 20MPH it does not like it, it seems to run rough between 2nd and 3rd gear yet before it was OK,, I've checked plugs, leads rotor arm, and all other wire connections all seems to be OK. I have been advised it could be the ignition module, the trouble is,I don't know where it is situated. I know it must be near the distributer. I would be grateful for any suggestions.

Many thanks

RMP