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I don't know if I'd look at the Fuel Pressure regulator , the Crank sensor or the Amplifier yet.
What you missed with your tune up was to clean both the Throttle Body and the Idle control module. The butterfly in the throttle body does NOT seat when foot is off the gas. So if the Butterfly and inner of the throttle body are dirty it will act as though it is seated. My thinking is...When engine is cold, you might get away with a bit Richer condition by having the throttle body sealed but with engine warm the sealed throttle body might flood it a bit. Then you give it gas, open the seal and it starts.
Idle control valve might be lazy and again lets you start in a richer condition. If nothing else. You cleaned them for the price of a can of Carb cleaner/ Throttle body cleaner.
Just for giggles, take off the front hose of the Fuel Pressure Regulator(the one with no clamps holding it). make sure there is no gas in that hose. If there is, then the Regulator is Bad and raw gas is following that hose into the Intake manifold. Once again forcing a Rich condition that a hot engine wont like.
If you need details on how to clean these things, write back and let us know
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'75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.lyse.net/brox/TonyPage4.html http://cleanflametrap.com/tony/
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