I hate to say it, but, if it starts cleanly and quickly on all cylinders its likely to be a switch/sensor/ thermoswitch etc.
Does it run cleanly?
Are the fluid levels correct?
The fuel injection has a cold start system but the ECU needs information from intake manifold, water temp and incoming air flow to maintain its running.
Get on the web and go to Porche owners forums or find your nearest (Bosch?) agent to help.
Wikepedia says there are 3 engines and they use Bosch Motronic systems. See what yours has and search for diagrams/handbooks etc on the web/ebay. There's piles of stuff out there for Bosch systems.
SOURCE: porsche 944 electric fan keeps running even when ignition is turned off
Replace the cooling fan relay, another person had the same issue, that's waht it was.
SOURCE: 1985 944 porsche speedometer stop working
First place to look is behind the dash. Its unlikely to be the 'sensor', as its a cable driven speedo...this would suggest the dashboard panel is falling to bits...you may be able to pick up a scrap on from somewhere...
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