I had this exact issue and just fixed it with a new ignition coil. I bought a bosch replacement and I haven\u2019t had the issue since.
Make sure when you replace these you use too quality plugs from a reliable parts store, too many stories of bad fakes or lower quality products from online sources. Coils are also likely a good idea at this point, again go with Bosch, again from a reliable source.
Working well so far with accuspark dizzy and leads and no issues. I have one on my MorrisMini project as well and provides good spark.
As per ignition coils, the only ones you should buy for N43/53 engines are Bosch. All the others (Delphi, Febi, HP etc.) are the same Chinese coil sold under different names, same issues as the counterfeit parts.
I'm running Bosch and have been for 45k miles with no issues, even tuned running extra boost which demands more of the ignition coils.
IF I can't find that product available, I can ALSO use the NGK 48977 U5084, and that's usually a few bucks less than the Denso.
I installed ngk coils originally and they lasted the longest ( around 8k miles before the first one went ).
I bought a new Bosch coil from TT because the original in my '88 Scirocco 16V didn't have the exact readings the Bentley said it should have. The new coil didn't have the correct readings either according to the Bentley and it didn't make my Scirocco run better.
I replaced all 4 in my tuned stage 2 q3 2013 to red bosch coils. 1 of the red ones died last year.
I just bought my son three coil on plug ignition coils with the NGK box but country of origin, China. I'm not happy with any Chinese crap.
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