[FearlessFoe]

Check to see if the injectors are spraying good.. Check fuel pressure.. If there is too much, too much gas is getting in and it isnt getting burnt.. It's rare, but if too little gas is getting in and the concentration isnt enough to ignite, the gas will not ignite and it will just get thrown into the cat. So too much or too little gas is bad. Also, try replacing your oxygen sensor and see if that helps. If that's malfunctioning, the computer could be putting too much gas into the mixture. Also, is your oil level steady? Oil burns differently than gas and produces more HCs than regular gas. Make sure to gap the plugs too.. and make sure the connections on the boots are tight. If you have to, squeeze the boots a little with pliers to get them tighter so they make better contact with the plugs. Good luck!