Can anyone help me with this, my '95 S 320 w140 has a rough idle problem and I changed the spark plugs but is still there. Should I change the wires and the coil also? How do I test the coils anyway?

If this helps, see photos here http://benzfanclub.ning.com/photo


thanks

What condition are your engine compartment wiring harnesses in?

Brett

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1997 S600 sedan

Start by changing each of the 3 plug to coil connectors under each coil and use Bosch F8DC4 plugs..
..if the harness looks good...........