Petruski

I drive on 98 octane, and i'm from Norway When the car is warm it could take up to 20 sec to get it started, and if let of the accelerator, it will stop. It seems like there are to much gas coming in to the engine, and therefor the sparkplugs are getting smutty. What can i check for on the o2 sensor? And is it two or one of them? We don't have so many Skylines in this country, and there isn't any shops that know anything about it. Thanks for your reply

Hi there. I have a Skyline R33 Gts-t that won't start easy when it's warm. Starts perfectly when it's cold. When it get's a little warm there are heavy black smoke from the exhaust at low rpm when i hit the accelerator. It also knocks on high rpm. There are two error codes on the ECU, One for the knock censors, and one for the temp cercuit. I have changed both temp censors. What could it be? The car is standard except from an open air filter and cat-back exhaust. Petruski, Norway.