1999 Taurus 24v miss

Has 143,000 miles, plugs changed 3 yrs ago with motorcraft. Has a miss on #3. Check engine may be a egr sensor. When the outside air temp is cool it runs ok, but if air temp gets hot
and car has it while at work it runs ruffer and wants to almost stall when taking off. What could the hot air temp be affecting? Has a lean code P172 or close to that don't remember, think its on bank 1. No vaccum leaks Thanks,
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