Mine does the same thing. I have an 04. I suspect it's a fueling issue because the tb is clean, injectors are good, everything involving spark is good or has been changed. I suspect since it's returnless, there is a mechanism in tank with the pump similar tk a fuel pressure regulator that is bad, or the pump is weak during the first start of the morning. I'm just thinking outloud, but I suspect a fueling issue on my end.