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I found, by google, another boxster with the exact same problems as mine. (another forum). But the thead had only one reply and nothing came out of it ultimately. His explanation is much better than mine so I thought I would borrow his words, as mine were probably overly dragged out.
1999 2.5 Owner from 2006:
"I have been having an issue with cold starts. The problem only seems to manifest itself if the car has been garaged overnight. It does not happen if the car is left in the hot sun during the day. The first time I attempt to start the car in the morning, it will cough and sputter and then stall out. Usually (but not always) the second time I turn the key, it will start normally. However, on some morning it will take me using the gas peddle to get it started, which usually causes the car to backfire and make rather nasty noises."
Underlined: I have yet to try leaving it under the hot sun, it's garaged usually and still not warm enough. But I have roughly timed, anything less than 12 hours of inactivity will not cause this start up issue.
Underlined: I have tried by catching the gas pedal on start to accelerate the warm up process, and have it the rpm at around 1100~1200 RPM. 9 times out of 10 the rpms will wobble and stall out (sputtering), if I press the gas right after turning the key. The lighting in the car will also flicker tremendously. These days, it takes about 2-3 fire ups before the car starts and idles nicely. The car would sound rough until some form of ECU adjustment kicks in (~1 min) and raises the RPM to 1,600, then back down to idle RPM. After that, the cars good to go and the problem will not surface again until it's been left over night.
I apologize for the posting the same problem twice, just the original post and terminology was so poor and ambiguous I decided to find a better explanation from someone slightly more mechanically inclined.
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