2006 starting problems
 

My mom has a 2006 Non-Turbo. She is having problems with starting. Only happens when it has sat overnight. She has to crank on it for a minute then tap the acclerator, to get it to start and occationally it will back fire. But it runs just fine after it starts. And has no powerloss. and will start just fine after that initial time. At first i thought maybe water in the gas. We put some Heet in it and that did seem to help for a while but has come back. Any thoughts would be apprecitated.