Hi, i've had this problem for a few days now on my 9A converted mk2. It is that when I'm driving on part throttle occasionally the rev counter will drop to zero and the engine dies for a second and then bursts back into life often with a loud backfire out the exhaust!
It doesn't seem affected by operating temperature, car drives perfectly under load and wide open throttle, starts perfectly. I've tried a known good coil and distributor to no avail, have also recently changed the plugs, leads, dist cap, also changed almost all the short flexi vac hose joiners, cleaned the metering flap and throttle body.
Any idea where to go next? The thing is driving me mad!
