I have a 2009 r55s clubman and I started to have rough idle issues 1st thought it was maf going bad changed it to Bosh OEM when I unplugged my original the idle didn't change for about 1 min
after a few days it got worse there is a lot of white smoke and the smell of gas took out the spark plugs to see if mabe one failed or coil failed switched plug and coil 2 to 3 and same thing 2 would not fire looked. In plug 2 hole theres visibaly gas just sitting there . Only in #2 everything else seems good
car is decated forged blow off
Any advice / assistants will be greatly appreciated
p.s new to forms nice to meet everyone hopefully it's a simple fix and can get back to building this light fun lifesize go cart .

 

welcome aboard

Do a quick compression test.

replace the fuel injector. I had a similar issue where gas was accumulating over night and cause the car to shake like it has a vacuum leak.

here is mine

 

Compression seems fine 155 psi noticed when I took off intake vaulve theres a lot of carbon build up o believe this can b my issue I have 43,000 miles right now so thought I wouldn't have buildup but I'm ordering wallnutshells and kit to clean then I'm gonna check again