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CEL Code 2-4-1 900 1995

I'd start with the easiest thing to check first. Loosen the two 9 or 10mm bolts that attach the egr tube to the top of the manifold and gently bend/cant the tube towards the valve cover. You may find a large carbon "booger" right there clogging the tube. Also check to make sure the vacuum hose that attaches directly to the EGR valve has not simply come loose.






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