Check engine light keeps coming on and smell strong fuel fumes from exhaust?

Unfortunatelly there is no real way to tell without knowing why the check engine light is on again. Something to check is to make sure all the wires are all the way down on the spark plugs and clicked on. Aftermarket wires have a bad habit of creaping off. Next I would pull the cap and look for some type of carbon tracking inside will prob look like a small lightning bolt. Otherwise there are a lot of places that will scan your car for free. Good luck