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Message: <blockquote data-quote="07GtS197" data-source="post: 1420942" data-attributes="member: 20715">First off welcome to the forums!Now there are probably a few problems at play here. Do you have a vacuum pump? Since it runs rough at idle but fine under load its most likely a vacuum leak. If you do have a vacuum pump you could check the egr valve for functionality. Its possible that it needs to be cleaned or is damaged and stuck open. You can also pull the vacuum line off the egr while idling and feel for vacuum.The p0171 and p0174 are lean codes for bank 1 and 2 so it would seem as though you do have a vacuum leak but the p1151 indicates a fault in the o2 system. Given these codes and the fact that o2 sensors usually throw lean codes when they fail it would seem that both front o2 sensors need to be changed. You should have rear o2 sensors too if Im not mistaken, you should replace those too.I would still perform an egr function test first but o2 sensors will need to be replaced soon.</blockquote>