Shaking 95 T-Bird

I've taken my car to a shop to get scanned; results indicated that Injector #2 was misfiring. I changed that specific injector, but the problem persists. Basically, when I begin the car, it will start smooth, but 10-15 seconds later, the car will begin shaking and the rpm's go down to about 5. My check engine light is on. I've changed my spark plugs the wires, but the problem persists.
Basically the car will run but continue to shake, specially when I come to a complete stop, the car will shake even more and the rpm's will go down dramatically as it seems it will shut down, but doesn't. Sometimes, the car will not shake at all! Please somebody help me with this problem as i'm ready to have a stress dilemma:banghead:

Use a noid light and check if the wiring to the injector is good. A bad connection at the injector will cause a misfire.
Use a light you plug into the wire and on the plug and watch if you are losing power to the plug.
Check compression on this cylinder as you could have a weak or broken valve spring.

sounds like u just have some bad wires somewhere off the #2 injector get a flshlight and start tracing the wires back till you see a broken or shorted out wire. then replace it