First thing is to make sure none of the wires are broken in the coil connectors. Second is that you can start the engine and disconnect number 4,3, and 2 coil connectors and the engine will still run on number 1 cyl. Then connect number 2 and disconnect number 1 cyl. Keep moving along so you have the engine running on each cyl by itself. If the engine dies or runs rough on any cyl then that coil, spark plug, or cyl. is probably bad.
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