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If you have tested everything, then how do you know that it is the #4 cylinder? Have you run a compression check? It only takes about 20 minutes to do. Also, here are a few things you can do. I keep a spare fuel injector laying around, so I can do diagnosis of problems. If you have one (NA or TT, doesn't matter) then disconnect the injector connections and put that extra fuel injector on each one. Remove the CAS and with the fuel injector on only one connector, turn the CAS. If the injector clicks, unplug it and move on to the next one. This will test out your harness to make sure that it is good. You can also do this with a multimeter, but that just tests the wires and not the actual connector as a whole. I recently was doing work on Memeber "WES"'s car and when it was all back together, he was only running on 2 cylinders. His wiring and connectors were all jacked up. tested it all with the extra injector and replaced all the wiring. runs great now. Those would be the two things that I would check before you go off to a mechanic. Check the wiring as described. That will tell you whether or not it is the wiring or the injector, and test the compression (about 20-30 minutes work) If you still come to the same deduction, then go somewhere. Also, you can remove the injectors without pulling the plenum, with a little time and a dremel.
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