Have you changed your spark plugs yet? Try checking your spark plugs and also make sure that you have the correct gap. I also suggest that make sure that your timing is correct. After all this then go to Pepboys and buy the additive for the fuel thats suppose to help you pass smog, I forget the name. Your suppost to fill up full tank and put the additive in, recomend half tank and the additive. I had the same problem with my eclipse after I did all the after market mods it was really hard getting it to pass smog, thats why I sold the peice of junk . Well try those thing first any questions just email me and ask. I'll think of something.