interesting problem with 5000tq

[igor cepic]

Hi,Everybody.I usually dont post,but check archives every day or so,but
now I have interesting problem.A car is from my friend,it is a 86 5000tq
Here is.
A car start fine run for 30 min or so,and shut it self,so far my friend change 
timing belt,fuel pump,fuel pump relay,and we swaped ecu.Same thing
A car is getting spark when is no start condition,so I think that rpm,hall sensor are fine
and ignition module too.And also after some time car start fine then stop
What do you think
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