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You need a good person with a pro grade scan tool computer. That should give a hint as it is likely to be sensor related. Change the fuel filter anyway.
Where is the fuel filter located on a 2003 Mercury Mountaineer?
It's under the vehicle in the fuel line from the tank to the engine.
This could be a lot of things. Have a computer scan done to see what the issue is. Could be a bad poppet or water pump. There is a sensor in the oil tank that can cause this too. Also the throttle sensor.
go google and type in-- workshop manual for mercury optimax outboard-- there is apage mercury- marine.servicemanualvault.com
which sows manual in pdf form for $4.95 a down load
run through the pages to find the transmission section and if it suits what you want , down load it and have a manual for all the items you need to do
talk with a mercury service shop and get the details of how to do it
I'm sure that you have to remove the leg from the power head so that you can get the selection lever free from the forward/ reverse dog before that gears will come out of the case
could be several things , Check fuel pressure and flow, if flow is low replace fuel filter, if pressure is low check fuel regulator, if ok replace fuel pump. Check throttle position switch for smooth movement . A misfiring coil or spark plug HT cables can also cause this fault.
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