the people that made the chip "burned it" said that they took care of the o2. i did notice that the first day i got it and asked the guy where the sensor was and he said that pyr had burned a chip that eliminated the need for the o2 and set it for perfect air/fuel and fuel maps. i did pull the spark plugs and one had a very strong gas smell though...and one did have a very minut trace of oil on it so im goin to buy new ones bkr6es from ngk is what's in there.....hopefully that will fix it from the stutter but as far as the smoke goes any further input would be greatly appreciated. thanks guys keep em comin'