As title says folks my stage 3 saff had developed a misfire on boost. It only does it somtimes tho and iv changed the most obvious,been the plugs.put new NGK's gapd to .6 and then put new 071C in also gaped to .6. I renewd the the disy cap,rotor arm,phase sensor n crank sensor last year so im thinking posibly a lead braking down or coil??

 

could be a host of things tbh! 1st of try a smaller gap on the plugs

 

I know mate! Unusual to run less than .6 of a gap tho,iv ran .6 for years....
Iv also got a loan of a coil off my mate and its sfill the same the bas...

 

its been many years since i had a cossy but mine developed a misfire and was spitting 6 foot flames out the back. i phoned mark shead at mad and he said is coil lead close to map sensor and it was. moved it and all was fine after that. dunno if thats your prob but worth a try.

 

As above, you really need someone who knows what they're doing to take a look or you'll just end up replacing bits for no reason. Just to add other scenarios, it could be a dodgy connection on the loom, fuel filter, tps etc etc.