Re: Rough idle
with it raining, and I'm sure colder weather there - the smoke you see is probably just condensation but there is potential it could be a head gasket - though, esp with a dead miss, you'll see a fair amount of 'smoke' from the tailpipe
Before you parked the stang did you drive it in heavy rain?
There's a possibility that water got down the coil valleys or you've got a bad coil..
A couple things you could try : next time you've got the dead miss, pop the hood - start unplugging either the injectors or the coils, see which one you disconnect does not affect the idle quality.. and chances are that's the dead cylinder. From there, swap the coil with a different cylinder, and repeat the process - see if the miss follows the coil..(make sure the coil bore is clean/dry when you're checking this, and don't be afraid to use dielectric grease
2012 IS F Blue IS F Sport
2006 Mustang V6 wannabe