Hey guys i just came back from a 3 weeks trip and i go to start my car and it wont start, it will turn and turn but it wont fire up. The spark plug cables were off and the valve cover was covered with a towel. The battery was also unpluged. Now i get spark, and i get fuel. The battery sparked when i put it on but i checked all fuses and everything is good. What do you think it could be?