1990 964 Starts and runs fine for abut 5 minutes then starved for fuel if I turn the key off and back on it runs OK for 1-2 minutes then shuts off, that is how I got it home one hand on the key turning it back and forth off-on replaced the DME relay and it did not help any ideas?

 

Could be many things.

First one that comes to mind is a vacuum leak.

Can you smoke test your car to get your diag started?

 

you need to check fuel pressure. sound like your running out of fuel.but with out seeing it it's just a guess.

 

How fresh is your fuel filter? Sounds like a fuel delivery issue. If the filter is recently changed, I would check the fuel pressure. There was a recent thread that discussed the testing.

https://rennlist.com/forums/964-foru...placement.html

 

Turns out the alternator was bad