need help for 944

I have a 1986 944 non turbo, have replaced the fuel pump, main computer, DME computer, it starts but won't stay running. Any Ideas?? Need help.

Umm how long did it go without running? if you let it sit for a long time the gas could have gone stale. hopefully it didnt have a full tank, but if this is the problem you could just run it till new gas circulates. hope this helps.