My 107 280 SL has a really strong motor that starts first time and idles nicely.Most of the time it accelerates fine and cruises at speed well however it sometimes has a miss (slight hesitation) under acceleration or at speed. Ive changed the spark plugs, installed bosch ignition leads and new distributor cap and a new fuel filter. I thought I would start with the easy things first however the issue is still there. Im running the car on premium unleaded which the car seems to like. The...