Maybe- if you washed it, you got water in some engine electric stuff? Until it dries out, it may not run/run well. Used to be a big problem with distributor/older cars and wiring looms under the hood. Not as common today, but possible. If you can get it to run well enough to warm up under the hood, and it goes away, this was probably the case. I wouldn't panic just yet. Maybe eyeball all your fluids, filters, dash lights, etc. before warming it up as a precaution.