My car is going well, great power etc but this last week it has decided to start dieseling. http://youtu.be/hq3_CUTK3Rc I dont know if this is related to the fact I accidently put 91 octane (with 10% ethanol) in the car last week. When I realised my mistake I drove home gently then got a mate to come over and syphon the petrol out into his car, fortunately his commodore was nearly empty and could take all the fuel (couldnt syphon from the fuel cap for some reason but had to go in via the cover on the tank). There was about an eighth of a tank left when we finished syphoning (I needed to leave some in to get back to the station). I filled up again with my usual 98 octane Shell V max. I also put in two bottles of Nulon Total fuel system cleaner because that has been proven to raise octane significantly. I'm also trying to avoid going into boost until I've burnt up the current tank and refilled again to further dilute. The idle is high because it needs to be (car will stall when dropping from high rpm otherwise - UAS have done the best job they can to fix but there is a problem with my computer or something - at least it doesn't flood on start up anymore). AFR is around 11.5, recently had Nistune tuned at UAS (Boost is 15 psi).