delta 88 hard start

Hard start only first time ,no codes so far I’ve done
- change fuel filter
- check fuel pressure 50 psi
- pressure holds for 7-8 h , comes to 0 Psi after night ---not sure if this is OK
- check and change 3 leaking injectors
- check vacuum OK
- check IAC valve
- clean throttle body
- change wires
- check ignition coils
I checked the general GM wiring schematic and it looks like when the car is already running the fuel pump may run on oil pressure switch . If I pull out the relay the car dies. Is this normal ? I am not sure if this may cause the cold start problem ??? or is the crank sensor or TPS adjustment

I found this article which may be of some help. It sounds like GM have had some issues with cold start, and you may want to check the electrical connections in the crankshaft position sensor circuit. On my 88 Delta 88 I have found the coil resistance to be off spec when cold and then improve (but still off) when warmed up. I get 16K, 25K, and 47K when cold and they improve to 14K, 14.5K and 19K when warm. The article at the link suggests they should be 5-7K.

http://www.mightyautoparts.com/pdf/articles/tt76.pdf

Have you cleaned the MAF sensor? If like mine it is very easy to remove - 4 screws. Using small paintbrush and solvent like acetone you can clean off the wires which may be carboned up.

Ron