Pressure washed under carriage let dry and now rough idle and bluefish white smoke help

No check engine light or any other lights. I thought o2 sensor also. Oil is clean no other problems. I was going to unhook the battery and see if the system would reset. I appreciate your comments it is always good to have an ear to talk to. Thanks

Thanks a lot. I have it in the shop with a good fan blowing on it now. Do you know if the MAS is anywhere close to the bell housing of the tranny? I did spray down on that from the top. But did not come close to the distributor/ coil area. I always kept the nozzle below the crankcase.. Once again I appreciate you comments