I have been slowly replacing parts and fine tuning my 1988 Lucas V12 for the last 2 years and have achieved what i would say a very smooth idle most of the time.
But it was not 100%, sometimes a bit off when cold, or the odd hiccup now and then.
I may have found what seems to finally bring the idle to 99.9%
smooth?! Marvel Mystery Oil in the fuel. I added about 5oz per 10 gallons on last fill up. Not sure what its doing, perhaps it is helping treat our modern ethanol gas which our cars weren’t exactly designed for? Or it’s just helping smooth out the injectors? Or ?
I have no affiliation with MMO, but at $0.25 per ounce cost (if i buy gallon for $32), i think I’ll continue!