So got a check engine light on Monday saying insufficient flow to egr valve. I researched this and my plans are to take off the egr valve and clean out the two ports ppl are saying to clean and if this doesn't fix it then change the dpfe sensor sense that's what everyone says is usually the problem. I don't have a vacuum pump so I can't diagnose this that way. Any suggestions on what I should do or anything to look out for while getting to the egr valve ?