Clean the EGR valve seat. The EGR may have become stuck. A good way to check for vacuum leaks is to use smoke near every intake vacuun hose . And near the intake manifold. The valve will **** in the smoke. If you clean the EGR valve and it still misses. Replace it. The EGR can cause random misfire.
Testimonial: "ok ill give that a try i never herd the smoke test before but i like it sounds like it will work"
All that has been done, replaced egr valve still has codes PO 171 PO 300 01 02 03 and P1297 any other cures
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