just the the blazer smogged today. even with a brand new cat, new plugs and new oil change i barely squeeked by. max emissions were 112 PPM @ 15mph, and the truck did 111. the tech said its basically unburned fuel(running rich). she did better for the 25mph reading. what could be caussing this? the truck has always kinda smelled rich at idle, at least for the 4 years i've owned it. what are some things that i could check? oh yeah, the truck came with a performance chip. forget what brand but it requires 91 octane. could the chip be the culprit?