got a gremlin

this is gonna be a long post so hold on. 09 m8 w bd pump gas turbo randomly dies. after riding for a bit if you let it idle it will drop down to like 1100 rpm and drop a cylinder then if you barely feather it back up the cylinder will come back at 4000 rpm but it usually dies before it gets up there. if it does die it wont start for ever then randomly starts and runs great. the other nite had this happen and it fired back up after 20 miniutes and would idle on both cylinders but at 4000 rpm and over it would drop a cylinder again. rode it out 23 miles on one cylinder. ive bypassed the bd box and still does it. ive bypassed the coolant temp plug and still does it. all electrical conn. have been blown out and di. greased. no codes on dash, no inj. code on bd box. WTF!! thanks in advance

dealer recently had whole sled apart coils tested good, good ecu,ccu,stator. no wiring harness shorts. the chassis ground was disconnected and that was why i had no spark before. ground wire fixed and now this!

found the problem, two inj. wires on stock inj. plug were rubbed through there casing and shorting out on the fuel rail...sometimes:face-icon-small-dis thanks for info though