Well, it's only been one trip back and forth to work (about 80 miles), but what a very noticible difference. No rough idle whatsoever, a very smooth 600-700 RPM stopped in gear and about 1000 RPM in neutral. Felt like more power too going up the mountain coming home, no downshift as before. The NGK's were TR5's, which is a couple of heat ranges down from the Bosch. Did not know these engines liked the Bosch copper cores so much - I'm convinced. Will keep an eye on cylinders 1 and 3, hopefully the only problem was the plugs. Thanks for the replies. Don

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93 190E Sportline (RIP) (45K)
92 190E (Xferred most Sportline parts to this body)
88 300CE (71K)

And the Jeeps:
01 2WD Cherokee XJ (35K, Mama's grocery/kid hauler)
91 4WD Comanche (300HP stroker)