help needed

[Badboybox]

Was out driving my 1998 boxster drove great .when I got home pulled in my driveway
Got out to open garage the car started to run rough then turned off.tried to restart , it would start
But only run for maybe 3 to 5 seconds then turn off.if I touched the gas pedal it would turn right off.
Had to push it into my garage as it would not stay running long enough or let me hit the gas with out it turning off .it turns over no problem.i have no check engine light on at all and have no codes.i pulled the MAF sensor and cleaned it now the car turns over but will not come on at all.does anyone have any ideas of what it could be.it just seems so random that one second its running great the next its not wanting to run at all.Thanks again for any help.