Thanks for all the valuable advice given! Appreciated!
Fuel quality: I presume that this is an unlike cause as the engine is fed with 98/100 octane only.
Carb set up change: yep, exchanged the carb as we hoped that the sympotom which was present with original carb would be abolished....no luck here -
Idle speed: yep, presently in the range of 900rpm (always was past 10 years).....will decrease and see / hope
Good hard run option:
- like that one.......could be an option as I had to creep in slow traffic lately.......not impossible that „coal“ is present in the system - still: Never had that before even in hardest (slow) traffic conditions.
Ignition timing: another option from my point of view as it could be a combination consisting out of several smaller effects adding up. Any advice?
Before I forget: camshaft installed is Comp Cams 33-000-9 and MSD ignition module 6AL and MSD 8592......