misfire

[log burner]

hi again been busey
my old 109 has a bad misfire from cold which kicks out blue smoke on each misfire as its like uburnt fuel once warmed up its 80% gone alone with the smoke .ive tried cracking the injectors one at a time to see if any change but thay all make a differnce. she pulls ok 60-65mph but iam lost on the misfire i did notice by mistake one day when i was hafe asleep i put 5 pounds of petrol in her thinkin shes gonner run bad but she run well even better on the misfire crazy