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If the boat idles fine and revs fine in neutral in the water and idles fine on the trailer, however has no power when you stick it into drive and give it some throttle a common problem with some of these early Mercury V6's is in the stator. The only way to fix this is to replace the stator.
Probably a bad idle air control valve.
Replace the plug wires
Sounds like the throttle cable is broken.
your tcc could be faulty, assuming its an auto. faulty neutral switch maybe
You may have a faulty coil. Check mass air flow sensor
No, you may have to check your idle. You can change the idle so when you put it into gear it will not die. You must make sure that the engine is warm when you adjust the idle or it may make it hard to start when the engine is cold. When it idles in park or neutral it should sound a little higher than when it it idles in gear or drive or reverse.
One possibility is a defective lock-up torque converter solenoid. If it runs and idles fine in then this would be what I would check first. Disconnect it and if it then stops stalling in drive, you have found the culprit.
There are several things that can cause your 1999 Ford Crown Victoria to idle rough when it is cold. The most common cause is a leak in one of the vacuum hoses.
On a manual, don't worry about it, as neutral works just fine. Automatic, just pull the drive line. You may lose a little fluid, so re-check it upon start up. A four wheel drive should a neutral on the t-case. That will work fine for an auto, or manual.
you should check the fuel ingestion
remove both front and rear driveshafts or if your 4x4 shifter has a neutral position put the transfer case in neutral and transmission in neutral and it should be fine if no neutral is presant in the 4x4 selection remove drive shafts.