1 hour ago, IanS said:

The fact that the engine revs to 2K before the alternator kicks in shows a problem as the alternator should start charging below 600RPM engine speed. This could be down to the alternator having the wrong bulb in the dash or a wiring error or internal problems in the alternator.

Thank you for the reply, very helpful!

The dash light is a led one so it does not have enough current draw to excite the alternator, I think… 

Edited October 25, 20241 yr by ThanasisPolitis

Also you might try starting and running the engine with the alternator disconnected.

Thank you all for the recommendations!

I have tried everything without any luck, I have added extra earth connections to the alternator and distributor, shortened the coil to dizzy lead, added ferrite cores to the cables…

I spoke with the tuner and they said changing the spark plugs won’t affect the tune so I went  ahead and bought the APR6FS ones and to my surprise, there is no interference anymore!!!

Thank you all for your amazing help and support, much appreciated! ❤️