Car will crank over but wont start

Need help with my 2001 Mitsubishi Spyder. Was
driving down the road and was losing speed. I went
to give it gas but instead of speeding up and went
completely down and died. Pulled over in the
shoulder and tried starting it. It would crank over
but wouldnt start just like if you are running out of
gas but i had a full tank. 2 days before this
accident happened my stupid brother took off in
my car without my knowledge. It started raining
and he didnt know how to put the top up so
everything in my car got extremely wet. I let it sit in
my garage until the day i had this issue when i was
on my way to work. Can anyone help me please
before I start spending money