Question about 1995 Mercury Villager

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1995 villager, 280k miles. Rough idle in drive, not so much in P, N or R. Idle seems slightly worse with A/C on. Idles rougher on hot days 100deg . Does not stall, accelerates okay, gas mileage 20-21 highway, 15/19 city, have not noticed any recent changes in gas mileage. Tuned up within six months, (cap, rotor, iridium plugs), timing 12BTDC, cleaned EGR valve recently (passed TX emissions test), EGR works fine, replaced vacuum lines, visually checked distributer and optical window, visually and electrically checked MAF. In 2007 had some engine problems (not idle), problem source turned out to be the keyway on the crank damaged due to key turning sideways. Replace key with larger, better fitting key and, my personal favorite, JB Weld (also replaced idler, timing belt, seals and water pump). At wits end with the idle problem. Any suggestions?

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