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??