Motor only turns over with no plugs in

by Brian Oppelt
(Larksville Pa. Luzerne County)

My motor (Mercury Force Sport Jet xr2 120hp) ran perfect last time I had it out. Now, it almost seems like a dead battery, so I made sure it had a full charge. It's still sluggish and won't turn over. If I take the plugs out it turns over with no problem. I did the tissue paper test and it blew out all 4 cylinders with force. Put the plugs back in and it won't turn over.

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