I would check to make sure there is spark first. If you dont have spark then the fuel wont burn and will be pushed out the exhaust. If you got good spark at the spark plugs i would check the fuel side. If you have a fuel injector(s) stuck open it will be spraying fuel when it shouldnt be. With the vehicle misfiring the check engine light will come on. The following link tells how to retrieve the codes.-
http://www.freeautomechanic.com/diag...blecodes8.html