93 Blazer started shaking

Driving home the other night about 60mph for 28 miles. Got to town drove 45-50 mph. It was raining. At 50 mph the thing starts shaking like the tires were coming off! Gave gas, got worse. Let off, it was fine. Came to a stop sign. Idled fine. The rest of the way home it was fine. My tranny fluid was a little low but that is it. Two days ago now and nothing. What was that? Any ideas? I have the cold air intake on it. Could it have been the oxygen sensor due to the rain or something? It is a 93 S10 4x4.

Well, let's see, 60 mph, rain, possible puddles... think you may have driven through some puddles, got some wires wet and voila, missing ignition?

You mentioned it was two days ago, assuming that it is not raining, perhaps that was all this was.

O2 sensor? Not likely.

Sounds like a tuneup is in order.....