Mk2 Engine, Exhaust and Induction
Focus st225 , stage 2 airtec intercooler, mongoose cat back , airtec decat ,
Car was driving fine , serviced it with new bosch plugs . Now has misfire
P0300
P0301
P0302
P0303
So far I have changed following
3 sets of new plugs 2 bosch 1 iridium
Coil bosch pack tried on all cyls
Map sensor...