Chevrolet Repair: 1997 chev pickup, mass air flow sensor, mass air flow

Question
I have a 97 chev pickup with 305 it starts fine but if not  warmed  up for couple  minutes when taking off it hesitates and stumbles,but as soon as its warm it fine.replaced fuel pump o2 sensors,mass air flow sensor,cleaned injectors.trips no codes,tiered of spending $$$$  

Answer
Hi Gavin, Not sure what to say here. First you need to check the fuel pressure regulator, should have around 60 psi and no lower. Next be sure that the coolant temp sensor is reading correctly, in the morning it should be the same as the air temp or very close.

This is all I have

Have a Great Day                 Mark