Hello and thank you, I have a 2001 Jimmy 4.3 liter that has trouble starting after it's been sitting for a day or longer. The only way I can start it, is with starting fluid. The problem initially started a few years ago and only had problems on occasion. Then it kind of fixed itself and didn't have any problems up until now, where it won't start at all without starting fluid, unless the engine is warmed up and has been running for a while then it runs fine. I have replaced the fuel filter recently and the only code it's throwing is for a bad secondary 02 sensor. Any thoughts and suggestions are highly appreciated. I am thinking fuel pump but if the pump is bad wouldn't the car not be able to run at all or at least decent?