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Hi, I'm Greg (Indy-Tech).Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.Rgds Greg.
Is the check engine light ON when the engine is running .
Okay no check engine light .
I would do first a fuel pressure test and see what the pressure is .
Has any service work been done ,likr spark plugs etc.
Time lag could be the fuel pressure ,on start up it will pump for a few seconds to build pressure then ones started
pump kicks in and pressure may drop .
If any sensors was to be the problem you would have a check engine light ON.
To confirm the check engine light ,does it come ON with the ignition then go out when engine starts .
Okay Jeff you need to do a fuel pressure test .
But first :
Remove the hose from the throttle body and see if gunked up with carbon deposits a dirty throttle body can cause you
this problem also .
If dirty clean with a can of throttle cleaner spray .
Keep me posted .