Don't forget there are three parts to the coil pack.

coil
plug boot under the coil
wire to second plug

Damage to the second or third will also give the bad coil symptom.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles