Why is my car cutting out? Help me

[Bullseye123]

I need all your help before I go crackers

I have a Porsche 911 1987 3.2 supersport.
It was my childhood pin up car. I bought it 2 months ago. So here is the problem.

Start the car , set off great. park it up lock and leave. return press immobilsier and opens and beeps. great. Turn the ignition, car starts, great. runs for 20 or so secords then dies.NOT SO GREAT
The car will not restart. Get out lock it up. leave 20 minutes return and car starts up and off we go. great.

Now everyone said change the DME relay. Did do but problem remains.
Now Im fiddling with the radio with the engine on . I press the radio reset button and car power goes just like before. will not restart. I have a scorpion 1218T2 alarm /imobiliser.

Please can any of you petrol heads offer some advice.
Tony
United Kingdom

[busa_4]

sounds like u have an immobilizer problem.