'04 Escalade ESV starting issues...

[Chris97K1500]

Basic history, 140K miles, basic maintenance done, mostly by me. New Alternator put on about 4K miles ago. Been running fine. Last few days, it takes at least 2 times of holding the ignition key 2-3 seconds to get it to start. Cranks over, okay, nothing really different with sound, no grinding, whining, etc. First time the key is turned, it'll crank over 2-3 seconds, run, then stop. Second time, same thing, but continues to run. Drives fine, no missing, stalling, etc. Thinking maybe the starter isn't turning fast enough? I only drive it once a week or so, so I don't really know what it's supposed to sound like/how fast it turns over. Any advice, starter, crank position sensor, fuel pump? Thanks, Chris

[txab]

Check fuel pump pressure. Key on, engine off, 55 -62 psi according to the SM