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Q: weak of power on 1991 Volkswagen Jetta

car is weak no power runs on three cylinders
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The reason why your car is running on three cylinders must be determined. It could be a bad spark plug or plug wire, it could be a failed fuel injector, or a problem with in a cylinder of the engine. Determine first if it is an ignition problem (check spark, remove spark plugs and inspect), "listen" to the fuel injector. Using a mechanic's stethoscope (or use a long screw driver placing the handle end up to your ear place the metal tip end of the screwdriver against the body of the fuel injector), get a friend to crank over the engine while you "listen" to the fuel injector listen to each injector at the same point of the injector body. You should hear click, click, click as the injector is electrically opened and closed by the computer, if the injector is not being triggered you will not have fuel getting into that engines cylinder. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info.
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Hope you can enjoy all the snow up there this weekend. I hope to go to Tahoe next weekend!
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