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my '98 Johnson 225 ran great the first time I had it out about a month ago...2nd time out it wouldn't go past 2300-2500 rpms....tried testing the temp sensors in the heads but couldn't get a reading either hot or cold...probally did it wrong...can I unplug them to see if it makes a difference ?.....also when the key is turned on the warninglight/sounds...run their cycle but nothing is on when it does this after starting or under load