Ever since i changed my 83 1200ST nova form Lead to Unleaded petrol I have had a fuel issue where it ticks over fine but as soon as you drive and accelerate through the gears it starts to struggle, eventally cutting out and stalling. Whats the best fuel additive I can use, im currently filling the car up with Super unleaded as the Octane level is 99 which I thought would be closer to lead petrol being 100.
how offen should I use the additive and best place to buy it.
Thanks in advance