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My 88 corvette takes turning of the starter for up to 10 seconds before the car starts . never used to take that long to start . once started and run the car then starts easy during the day if started numerous times . The hard starting occurs after the car has not been started for several days .
Maybe we need to see if the pressure is bleeding down first. If it does, go further and see where it bleeds. OTOH, if the injectors are Multecs, toss them and the pressure regulator and see what the pressure does. If it still bleeds down, check the pulsator in the tank
Based on what? The idea that he has Multec injectors? Do your homework before making a SWAG and then getting frustrated that it didn't work. I don't trust Multecs either but we still don't know what he has tested yet.
Sounds exactly like the issue I'm having with my 88. Do you have a factory service manual? Similar to what aklim says, the FSM has you first check for fuel pressure.
Do a search under this section for "cold start" if you don't have a FSM . Someone had posted an image of the troubleshoot test.