The timing is spot-on, belt has less than 30k on it. Fuel Filter is brand new less than 6 months. Changed plugs and finally ENGINE light came on now. I might be getting closer to the fix. 2plugs had a oily deposit on them, 1 tech at my Toyota shop said he could smell Diesel fuel and just maybe I could have put in some gas that was contaminated with a small amount of Diesel, I have discounted that as being highly unlikely. But who knows, I would think that all plugs would have the show signs of bad fuel. Could this be a valve seal leak fouling the plugs just enough to cause incomplete combustion? I getting the diagnostic P-code and should get a little closer to figuring this out. Thanks to all