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  1. M

    Mercruiser 260 Won't start.

    I will apologize up front as this will be long, but I need a little help from the experts. 1986 Mercruiser 260's with thunderbolt IV. I noticed the starboard engine running just a little rough. It then shut down (no alarms, temp normal) I changed all plugs ( not excessively oily but black, no...
  2. M

    Thunderbolt Ignition problem

    Looking for some help, I have a 1986 mercruiser v8 (350 Chev) that has the thunderbolt. I noticed the engine was idling a little rough. A short time later the engine stopped ( like you turned the key off). I changed coils from the other engine and it started back up however still rough. I bought...
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