I am also having the 6-10 crank try embarrassment in my 04 Z . However, mine only hits me about every 4th or 5th trip. It’s bizarre. I thought it might be a flaky key-immobilizer glitch but it does seem to happen way more after long hot daily commutes here in the South US. I am following the same guesses. I went to new ngk iridiums , new CAI, cleaned then Replaced the MAF, seafoamed the intake to get rid of the years of blowby neglect previous owner inflicted on the intake , added catch can. Still does the nothing every few trips. I think I will try the FPR next before the cam sensors. In all fairness I had a wet plug when I got it so I just thought valv covers and gasket job, plugs , new oil, high octane and some hard pulls would clean the crud out. 6 months later now. No change. Humble pie hereWell today i replaced the cam sensors with new oem ones. still having the same issue tho. I did notice that if the car is running and I turn it off and immediately turn the key to start it, it starts everything. but if i wait more than 5-10 sec its take 5-7 trys to start again.
So my question is, does that sound like a fuel related issue? I changed all my coil packs my maf is new and works perfect, everything is showing signs of fuel being the issue. on crank my fuel pressure is only about 44-50psi while running it sits great at 62-64psi.