Sounds quite logical... Karen you'd need to clarify if the 'wobble' is a vertical wobble (the car feels like it's moving up and down like it's got a big flat spot in the tire) or if it's steering wheel wobble... back and forth type - the wheel wants to wobble while you've got it turned to that ...

Based on my own experience... This is one of those intermittent problems that will drive you crazy.

Absent any other test information, I'm going to assume that your car is losing spark, and that the fuel system is probably working ok.

I'm not sure if this year model uses the same thing I'm ...

Whoa man...
This is AC 101 subject for low freon situations in cars.

Look at your receiver / dryer on the right side (firewall) of the engine compartment. The receiver/dryer is an aluminum tube about 4" in diameter maybe 10-12" long with a couple of hoses attached to it.

There is a pressure switch ...

Zrastwicha,
If he wants $50,000 for the car then it's a bad deal. Used Ferrari's are cheaper.

You didn't mention the price, the one thing that makes or breaks a buying decision all by itself.

With that mileage, and he's the original owner, I'd be number 2 behind you if the price was right ...

Since this is a 1985... I'm assuming this is the system with electric fuel injectors, (not the previous year k-jetronic cis type)... correct?

If so, then you need to look for something that would attribute to all injectors (and fuel feed overall to the engine) failing at once.

Bad grounds, shorted ...

In so many cases... the O2 sensor is rarely replaced, (and IGNORED!) but it really needs replacing at 50K mile intervals (imo) for optimum results. This sensor is one of the most critical items in maintaining a proper closed loop fuel mixture management scheme. Without a good O2 sensor, your system ...