240sx engine revving problems

I washed my engine yesterday, and I think that is when the problem happened. It was running so sweetly, and now it will idle, but it's like it won't run on all cylinders. It sputters up through the rpm range. Everything looks real good, but it won't run right. Any ideas? I really need to get this thing running right because I just bought it to replace my other vehicl that broke down and it's all I have. You know what I mean. Thanks in advance for your help.

Nevermind, I started pulling plug wires off one at a time and the fourth one didn't change anything, so I knew it was that one. I Just took all of the wire loose and let it dry out while I was in class and it ran like a top on the way home. Big Relief!!!