Check engine i have a 93 mercury villager nautica version and the check engine light goes on and off, when you start the car it sounds fine but when you start accalerating it ont go more than 25km/h and the car has liek a shaky feelings and the engine sound slike its struggling, it goes on for about 10 seconds and then u have to push the pedal to the floor and sometimes it just wont stop n e helpp???

For 93 villagers, check for clugged EGR and PCV valve. 93 does not have the rubber piece that many posting suggested to check for other year models. Both PCV and EGR are hard to get to without proper lift and tools so I recommend to have a mechanic fix it for you. If the computer code turns out to be EGR, most repair shop would also want to replace the entire EGR when only cleaning up the carbon build-up within is needed. Of course, get a good tune up will always help anyway, new plugs, wireset ( if needed) , rotor and rotor cap.

When was the last time you had a tune up done and I mean spark plugs wires fuel filter and new drive belt ?
also check if any vacuum hoses are off the engine the one behind the throttle body look for that one