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Hello and thank you for your question,Actually on the 1994 the code should be three digits and that would make your code a 334 which can be set due to a bad EVR or a bad EGR position sensor which is more common. I have enclosed the factory pinpoint test in the link below so you can determine which is failing. Copy ad paste the link to your browser to open and view the steps. Run through them and see if this will help you nail this down.https://dl.dropboxusercontent.com/u/104923897/Code%20334%20Oct%2015.pdf
The code 214 in most cases is set do to a failing Camshaft Position Sensor . See the steps in the link below to check it.https://dl.dropboxusercontent.com/u/104923897/cam%20sensor%20Oct%2015.pdfCode 341 suggests that the Octane Adjust (OCTADJ) plug is disconnected which it is so its not a problem.
You really need a lab scope to get an accurate reading. Sounds like you may be dealing with some rodent damage if you have a nest on the top of the engine. Have you looked to see if any of the wiring may be chewed ?