1987 runs great most of time. On occassion, will not hold rpms and stalls. It only does it when the car does not fire right up and you give it a little gas. Sometimes it stalls all day, others just first start. It will only stall if it did not fire right up. No code

 

id start with the fuel pressure. see what its at when it runs and then when it didnt fire up right.

 

fuel pressure ok

 

Have you checked spark to see if you losing it? Also, check injector pulse with a noid light.