Well, I totaled all the parts up that were suggested and the total came to $546.79 including a radiator. I will have about $1000 to put into the car at the moment. I am really hoping those few items will take care of the problems I'm having. I figure labor will be another $400-$500. THat will set me right at my budget.
Here's the part list:
Oxygen Sensor
Overage Relay
Distributer cap
Distributor Rotor
new Plugs
Fuel filter
Ignition wires
Radiator.

I figured I'd just take care of everything at once, since I'm not sure when these parts were last replaced.
Please tell me if there is anything I am missing or if there are any other suggestions regarding the problem I am having.
Thanks so far, it's greatly appreciated.

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1986 560 SEC *Sold* < Big Mistake I miss my baby!
1988 300SE *Sold*
1989 300CE - current car, but not for too long