Paul
Is the EGR vacuum hose attached and free of splits, if the EGR valve insides were spotless it may not be actuating and you have a vacuum leak from the hose and this may be causing your lumpy idea on warm up / low idle (when the EGR is active).
Paul
Is the EGR vacuum hose attached and free of splits, if the EGR valve insides were spotless it may not be actuating and you have a vacuum leak from the hose and this may be causing your lumpy idea on warm up / low idle (when the EGR is active).