pin stuck in steering coupling
I remove a LOT of those, so I've seen it all. There are a lot of good suggestions above. PB Blaster is a MUST. I made my own tool by cutting off the head of a large Phillips screwdriver. It gives you a flat drive surface rather than a pointed punch which can spread the hollow roll pin as you hit it.
If you can't get it in the car, you can pull the steering box (as mentioned above) and work it on the bench.
Pull the steering column and separate the "guts" from the coupler. There is a small drive pin on the top of most couplers that you need to tap back to let the guts slide out.This is probably what is holding you up.
Once you have it on the bench, you have a 50/50 shot of drilling the pin out without breaking the bit. If you
break the bit, you will have to destroy the coupler to save the steering box.
Take a die grinder and cut the coupler where the pin slides in. You will not be cutting into the steering box splines, you will be cutting into the pin itself. Once you have a groove cut all the way into the pin, the pressure will be off and it should drive out. Buy a new/used coupler and use your "guts" Good Luck!