Earlier today I got in my car and started it up and it started but then shut right off, I start it again but keep my foot on the pedal and it runs. So I thought ok Im really low on gas that must be the problem. I get it to the gas station and get some gas in it start it and its still doing it and it did it all the way home If I let off the gas the car would just cut off. It wouldnt even stumble or idle rough before it died it would simply just cut out. I pull into my driveway and let my foot off the gas to see if its still doing it and it is fine. Does anyone have any idea what may of caused that? A few days before it did this I changed the cap, rotor, plugs wires and did a sea foam treatment. Fuel filter was replaced maybe 2 weeks ago or so. I can hear the fuel pump come on. Could it of just been bad gas? Thanks for your help.

 

It could of been bad gass. Was it only doing it wile the motor was cold or did it do it when it was hot also and just start running fine all the suden?

 

I can almost guarantee it's your IAC. Try cleaning it out. It probably has carbon built up in it.

 

I cleaned it out not long ago, It seemed like it did it when it was cold. Now it is fine even when cold. Also it Idles right at about 500 RPM? Isnt it supposed to be higher than that?

 

is that in park or drive, A350 will idle around 500-600rpm in drive and 900-1000rpm in park

 

He's right. You might want to adjust the screw on the throttle body to about 900-1000 RPM in park if it's not already at that.
So you said the car is fine now? Maybe something was jamming up the IAC and eventually it was knocked loose allowing the pintle free movement.

 

Yeah its fine now Idle is at about 500 rpm in drive goes up to maybe 550 600 in park.

 

I had that exact same issue and it was split vaccum line to T.B It would run fine , but let off and it would just stallout as the rpm's dropped. Could also be IAC like said above. Don't start messing with the idle screw just yet( unless you already have) . They usually don't unscrew themselves.