impreza random missfire help
 

hi i am new to this iv got a bugeye wrx 48000 genuine miles it keeps coming up with random misfires so got new plugs in still doing it cylinder 2 and 4 so swapped coils over from other side still doing it got a auto electrician in he said the air/fuel 02 sencor wasent working right so got new denso one took car out then light came back on missfire on all 4 cylinders so then took air flow meter out cleaned it put back in checked all earth straps look ok took down to subaru i plugged my scanner in to it before went to subaru came up with 2 ,4and 1 missfire put into subaru guess what came up with same 2 4 and 1 so i told them what i done they said its petrol related its ether the pump,filter,regulator or injectors so then got new filter and injector cleaner made no difference still coming up missfire codes sometimes its 2 and 4 then its2,4,1 then its all 4 but there no loss in power and its definatly no missfiring all 4 i also think its using alot more petrol help doing my nutt in

get it to a decent specialist

i was going to take it to a rolling road do you think they will be able to spot it

depends who the rolling road is, if they know impreza's they may be able to find out.