Is the battery going dead or is the battery/alt light on? If not, no to the alternator. Next, is the security light staying on or flashing? If not, no to the anti-theft system. Since the problem just started after the old fuel was put in, the problem has to be related to that. I would start by replacing the fuel filter. If the old fuel is still in the tank, I would recommend draining it, blowing out the fuel lines, and cleaning the injectors. If you can't do all that, try just replacing the fuel line and adding good fuel to the tank. I would also use a good fuel injector cleaner. If that doesn't help, then I would check fuel pump pressure and see if the pump is producing.
Let me know what you find or if you have other questions.
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Friday, January 29th, 2021 AT 10:03 AM