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After I purchased the car on Saturday, I drove it 200 miles home. I stopped before I got home at a store (the beer type), when I went to leave, the car cranked and cranked and cranked. Would not start unless I pressed on the throttle, say 20-30% open. It caught, I revved the engine a few times, all is good. It only did it when it was warm over the weekend. However, yesterday leaving work, and this morning leaving home, cold engine, it just cranks and cranks, this AM I had to hit the throttle to get it to go, then hold the RPM above 1000 to keep it running, did that for 10-15 seconds, and it went to idle fine.
#1. I changed the FPR on Sunday with one I had in another fuel rail. Not sure how good that one is, perhaps I replaced a bad part with a bad part. Note: I checked for fuel in the VAC line at the FPR, didn't smell anything.
#2. I tested my fuel pressure last night. Key on it went to 45 or so PSI, engine running, it held 40-42. I need to change the fuel level sending unit, its all over the place, as these commonly do with age. Fuel pump too? Delphi or ACDelco of coruse.

Now I've also read it could be a bad IAC, I am pretty sure I have one off my 97 in my tool box, I can check and see.

Any one else have any similar issues? Ideas?

Going to change the fuel filter today. I had a new one already in my garage.
Then I will re-test my fuel Pressure.
I have a TRE-340 fuel pump also, brand new in my garage was intended for my 1997, never ended up doing it.
Calling around trying to find a level sender (Dorman 911-022) or the GMC Tahoe replacement ($130.00 at my dealer no stock).
Does anyone know if an aftermarket level sender for a Tahoe or vehicle such as that will work? If I remove the arm like in the youtube videos?

unplug the MAF sensor and see if it stats easier........

just get the gm tahoe sender and replace the worn one - even if its back-ordered, you know its direct fit and will last 10 years +

I had a fuel pump go out intermittently with symptoms somewhat like that (had good pressure at the times I was able to check).
After a couple days it died completely.
Also could be flooding from a sticking injector.

I had had similar symptoms with a bad IAC

I have the GM kit for the Tahoe now, will do that tonight.
I will also do the MAF test.
Fuel PSI jumps to 55-58 with the FPR vac line un hooked.
New filter now too.

I now have an operational fuel gauge. Used the Chevy Tahoe kit and changed it last night. Not to bad of a job to do, had it all done, in 1.5 hours (ate some supper in between). Also changed my FPR, as that was prime suspect for the hard starting.
Last night it was still a little hard to start, even after a short drive. But this AM it sparked right up no problem, and even when I got to work, it started right up again hot. Maybe she just needed to sleep on it...? haha.
Today will be a trans pan drop, filter change. Then I can focus on detailing it up nicely.