Thanks, duc4208. I tested the plug wires and two of the three have bad connections at the resistor ends! (I obviously should have tested them right away). The coil on plug #2 is OK; I'll check the other coils next. Looks like I got off easy (for the time being).

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TomO
94 E320 Wagon, 170k, totalled in 2006
2002 BMW 525i Wagon, 75k
1991 BMW 318is (two of 'em)