Have you checked for an exhaust leak? Check the forward most and rear most exhaust manifold stud to see if they're still there, they commonly break on most 2.5L engines.
it is not exhaust leak it is a small knock in my motor i got up in under and put my ear to the base pan and everything sounds fine i used a piece of pipe for a stehocope and it seems to me as valve lash..
i am not a fan of putting transmission fluid in my engine i did it in the future and dont like it.. do any one know the valve lash or my intake and exhaust valves so i can check it myself to see how much they are out