I cleaned my engine compartment with simple green, a rag and water hose. The ne,t day I had rough idle and blinking check engine. Since I had to work, I parked it and fook car. The next week and a half it ran like it did when I bought it. Today it backfire under cruise load, it shimmy at idle and shimmy harder at accelerate from stop. nd blinking check engine light again. I am thinking spark problem somewhere, but where a week later? Could i have fried something when I moved it after cleaning?