I have 1986 porsche 944 it start and shuts off what is the problem.
You are loosing one of the two, spark or fuel, and the third component to check is idle speed check auxulary air valve, starting idicates that you do have a crank signal but is it continuous, check fuel pressure
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...
SOURCE: 1985.5 PORSCHE 944 digital clock (changing time)
There are three buttons, let's call them 1, 2, and 3, from left to right.
Clock
Time setting
A. 12 AM, PM or 24.00 h
With the clock in the time readout mode, keep
button (2) depressed for 4 seconds -12 AM, PM
or 24.00 flashing. After pushing button (1), either
a 12-hour (AM + PM) or a 24-hour setting
program can be selected. If you only want to
change the display mode, push button (3). The
clock then returns to its normal timekeeping
function.
B. Hours
Push button (2) a second time - hour display
flashes. Set hour by pushing button (1). After
pushing button (3)*, the clock returns to the time
readout mode with new hour setting.
C. Minutes
Push button (2) once more - minute display
flashes. Set minute by pushing button (1). Upon
pushing button (3)*, the clock is started -
accurate to within 1 second.
Stop watch function
The stop watch can only be set in motion if the
clock is in its normal timekeeping mode and not
during setting operations.
A. Push button (3) - 00:00 display appears;
B. Push button (1) - stop watch is on;
C. Push button (1) a second time - watch stops.
(Additional times can be added by pushing button
(1) again - stop watch keeps running. Push button
(1) once more to stop timing.)
D. Push button (2) - 00:00 display appears;
E. Push button (3) - normal timekeeping mode.
If button (3) is pushed during operation A and
B, the setting procedure must be restarted
(push button (2)). 
SOURCE: extra key lock
It's kind of crazy to think of it now, but back in the 80's, Porsche thought this was the most stylish practical place to put the switch for the alarm system. Some of them have it, some don't, as it was an option.
SOURCE: '87 Porsche 944 Turbo Airbag Light blinking incl. the "!" on dash
check the abs pump fuse .the abs pump or a sensor could trigger it. get a scan done...the code will tyell you what is wrong
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