The PO 336 is still present after the crankshaft position sensors were changed. Mechanic said he did a crank relearn. There was no difference in performance after these were replaced. Is the EGR feeder system the EGR line (metal line)? The opening in the intake seemed nice and clear and I opening of EGR was also but could be stopped up near exhaust opening. I will take EGR line off completely and check.