Not much in the way of TSB's for your condition.
One major problem GM is having is trying to keep the injectors clean. First thing I would try is a good injector cleaning. You can start with a bottle of additive for your tank but sometimes it is necessary to disconnect the fuel system from the injectors and run the cleaner thru a pressure pot to clean them.
Now the biggest thing I see is your engine knock above idle could you explain it some more? It could be a carbon issue in the cylinders causing this. Have you tried running a higher octane in your engine? Have you replaced your fuel filter in the last 2 years?
With your kinda mileage I would like to clean and reset the IAC! This will improve idle quality.
Usually an idle miss is caused by a fuel problem and off idle misses are caused by ignition. It is kinda hard to help not being able to hear see and drive the car.
Usually when I get a high mileage car I need to do some reccomended service work, its not cheap but I have to have the car's sensor data streams in range of where they are susposed to be.
I want you to remember that the crank sensor is used to start the car and the cam sensor takes over after the car is started. So that usually rules out the crank sensors, you have 2 crank sensors on your engine.
1995 was a weird year for GM cars, some cars are OBD1 and some are OBD2, and the rest are a hybrid OBD2. What color is your PCM? If its black its OBD1 silver its OBD2 or the hybrid. There has been some calibration changes to the OBD2 computers over the years and it could be possibly that a newer program would fix your car.
I could write a long list of things I have seen that could cause this problem but I don't think it would help you much.