W124 260E shaking

[JamesBrown]

After i got gas today my car started shaking and felt like it was misfiring and going to stall out. I don't know why it would start after i bought gas, before it was running fine and alls i did was fill it up, check the oil and clean the windows. I have a feeling that it is in need of a new distributor cap, rotor and wires because they are all old. I just wanted to know you guys opinion. Its also 85* here (car seems to run best when its cooler, low 70s) if that makes any difference.

Thanks in advance
James