So, night before last my car started fine at the house I drove it to the gym, about a 15 minute drive time total. 2-1/2 hours later I'm getting ready to leave the gym and the car studder starts and stalls and then will not start again. It cranks but acts like it isn't getting fuel. I swapped relays to see if that was the issue, etc just no fuel. I leave it over night and come back first thing yesterday morning after work and it fires right up, I drive it home, check the wiring harness socket under the fuse relay box and the trouble pin for the fuel pulp relay has a slightly bigger gap than the others, so I pull the pin from the socket bend the tab back tight and reassemble everything. Car starts no trouble multiple times, took it for a 20 min test drive came, back started multiple times again without issue. Got up yesterday evening and drove it some more trying to see if it would fail again before the weekend gets here. I have no issues whatsoever yesterday. Get off work this morning an it starts first try but is running kinda rough, go to back out and it stalls shifting from reverse to drive. Go to start it and it fires so I give it some gas, let the rpms come back to idle it dies. Then it just turns over like it isn't getting fuel again. I left it in the parking lot at work I'll go back this afternoon and see if I can get it started and back home. Occasionally when I'm driving and under acceleration it has kinda studdered and will throw a active handling and traction control light on but they go away within a few minutes. I'm wondering if the fuel pump is failing and the loss of pressure is causing it to miss and throw the codes, as well as the starting issue I'm having. I've been attributing it to bad gas. Any thoughts?

The socket in the wiring harness that had a wider gap.

 

The intermittent operation sounds like your fuel pump is on it's way out. You could check the amp draw on the fuel pump, usually a failing pump will draw a higher than normal current. Don't know what the norm is for the pump though. Before you do that, run all the suspect bad gas out and fill with a "tier one" fuel and monitor the situation. While running the bad gas out if it gets worse the closer you get to empty, its probably water in the gas , as water is denser than gas and will collect at the bottom of the tank. Good Luck!

 

If were able to attach a fuel pressure gage to the test port when it acts up, it would get you pointed in the right direction.
HF sells them for less than $20, and AZ offers them as rental tools.