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Re: starting help please..also posted in yukon forum
When you first turn the key in the morning try just turning to on not start and listen to how long your fuel pump runs. Should only run a few seconds to pressurize the fuel rail. If it runs a long time you may not be getting enough fuel pressure, Pull the vacuum hose off the fuel regulator and turn the engine over. If there's fuel at the vacuum port then the regulator is leaking. Change it. Check for fuel leaks around the injectors and fuel rail. I experienced the occasional hard start from purchase of my 2001 that wasn't resolved until due to a misfire condition they found a couple of injectors flowing too much fuel. Since replacing the injectors it has started every time. Hope some of this helps.
Dave
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