Running rough after washing engine bay.

Hi everyone,
 
So for one of my jobs over the Christmas break I decided to wash the engine bay on my SW20. But now it is running rough.
 
I covered the alternator and all electrical connection points in plastic wrap. I did not cover the distributor cap or ignition leads. I sprayed the engine with degreaser, then scrubbed it with a sponge using soapy water. Finally I sprayed the whole engine down using the garden hose (ordinary tap pressure, not high pressure).
 
The engine started first time, no problem. But when going for a drive to blow/evaporate dry the rest of the engine it is now running rough. There is a loss of power under acceleration. Even at constant velocity it shudders a bit. At idle the engine shakes noticeably and the exhaust has a deep rumbling sound. I think one of the cylinders is not firing.
 
Can anyone advise what the problem might be and how I could fix it?
 
Thanks
 
Dwaine

Yeah the dizzy and plug leads are known for having this problem.

Thanks guys. I have pulled the leads ends off and will let to dry overnight. Will let you know how it goes.

All fixed. There was water in the number 4 spark plug well. I mopped it up with some paper towel and a long screwdriver, then got the wife's hair dryer. Now I am back to Toyota silky smoothness.

An air compressor with a long air nozzle does the trick.