seem to smell petrol alot lately after removing the bung from my nurpec?? could this be related also a slight smell of burning oil, how ever no oil drops on floor no leaks i can see what could it be?? and lastly car seems very lumpy on idle the whole car shakes where as before wasnt too bad? i have a 98 sti any help would be great thanks vc

 

oil smell could be a rocker cover gasket and it dripping on to the headers.