Ok, replaced timing belt, spark plugs, distributor, map sensor, iat sensor, tps sensor.....ecu is NOT throwigng any codes, but I get a sweet knocking sound from the intake cam on the 1st cylinder. What the hell could be wrong here? I've opened the valve cover many a time and see nothing wrong, all my cam bolts are torqued properly and valve clearances are all kosher....anyone have any ideas here before I pay a billion dollars to have someone check it out?