k guys im having trouble with my exhaust fumes from my exhaust smelling like crap! it stings my eyes, nose, and makes me cough, it also gives me a major headache if i leave the car running for a long time. also number four cylinder is not firing, i know cause i pulled the spark plug and it had no hesitation on the idle, i also did a compression test and adjsted my valve already. the car is running on triple mikunis and back firing out of cylinder 4 is that whats causing the smell and hesitation on WOT? it is the choke?