very new owner needs help

[love it hate it]

hi,new to forum and new to porsche ownership.

bought 2003 boxster base,triptronic w/33000 and change 2 weeks ago.
ran fine for first week. great gas mileage.very happy. filled tank up at shell
station when a little under 1/4 tank left. next morning it made a strange
sound when starting like starter trying but no turnover.let it sit for a few minutes and
it started fine...next day turned key and it flooded..right off the bat..waited
again for awhile and it started. after work it flooded again..guy from work came out and got it going..ran okay home.. started it a few times later that night and it started fine but the same thing has been happening since..
two days ago it again flooded but i got it going..CEL light on steady..once going it seems to drive fine...flooded again to come home..next day same thing but CEL
light blinking..i shut it down...called independant shop in gresham oregon and
of course,it started right up to bring it in...
shop called last night and said the codes were showing misfires on all cylinders but
they could not find anything yet..plugs ok..and of course,it is starting fine there..
they think,but could not be sure,that it might be the coolant temp. sensor.

i havent even had this car 2 weeks...i should have kept my saturn..........

any help would be great...as i am not a mechanic and dont have one in the family
i have to rely on others........thanks so much