[passnbyu]

Hi, Mine does the same thing. We had it in the shop and they told us it was carbon build up in the valves. I ran fuel injector cleaner thru and it keeps the check engine light out for a couple of weeks but sooner or later it comes back on. I changed the plugs and that didn't help. When I had the intake off (you have to pull it to change the right side plugs) I took a fiber op. camera and looked down the valves. They looked spotless. Even the ports in the heads looked great. No build up. If you find out whats doing this I would like to know.
Thanks Passnbyu