I'm retired from 47 years in the car repair business so I'll give you my opinion on your problems.
The trac light is probably on due to a bad computer.....I would recommend just deactivating the light
at the instrument cluster and don't worry about fixing it.
On the cruise control , check under the hood to see if the cable that goes from the cruise control transducer
to the throttle arm is broken or disconnected. If that is OK you need a new cruise transducer.
There is a very high probability that all of the problems with the radio is the radio itself. The mid nineties GM
radios were a complete joke....they used to go out once a year when the cars were brand new. GM has very
well made wiring harnesses.....when you have an electrical problem in the dash it is almost always a component, not the wiring. I assume that you meant compressor, not condenser on the A/C. On a 95 GM car, unless the
car is low on freon due to a leak, normally the compressor is bad, which entails flushing the system to remove trash, replacing the orifice valve and installing a new compressor. The compressors on a 90's GM car usually go out at least every 80,000 miles, often much more frequently than that....they are a very bad design.
On the cig lighter you have a blown fuse. Hopefully replacing that fuse might help your other electrical problems as well, but that isn't too likely. Normally when the idle surges up and down you have a huge vacuum leak under the hood somewhere around the intake manifold. While you are checking for vacuum leaks, remove the
the vacuum line from the fuel pressure regulator on the fuel rail and make sure it doesn't have a blown
diaphragm....At that age the regulator should be bad by now. This can cause bad gas mileage, a funky idle and
sometimes results in the intake manifold exploding like a bomb went off inside it. If gasoline is coming out of the hose nipple on the regulator when the vacuum line is removed , the regulator diaphragm is busted. Your car is very clean and is certainly worth fixing. A 90's
GM car makes a fine hobby car but I wouldn't want one at this point as a daily driver.....
It will eat you up with repairs if you stack a lot of miles on it. The reason values are low on
these cars is it is common knowledge that they tend to break a lot. If the car doesn't have
sentimental value and you want an inexpensive daily driver, sell it and buy a 2004-2011 Lincoln Town Car. They are wonderful cars and the drivetrain and rear end will go 500,000 miles easily
if you use Mobil 1 motor oil and on the transmission, leave it alone and don't change the fluid and it will go 500,000 miles as well. I have seen these cars go 700,000 on the original engine and trans. Only caveat is you have to torque the spark plugs to 28 foot lbs instead
of 10 foot lbs like the factory did or they will vibrate loose and then blow out, taking the threads with them. Other than that, they will go 100's of thousands of miles . and will never break. The suspensions are bullet proof other than the factory front ball joints go out at 100k because they don't have grease fittings.