96 900s no turbo. Great car, but this fall started a habit of not wanting to start after sitting more than four hours. I crank the starter and it will fire and die. I am keeping my foot off the accelerator, clutch depressed, transmission in neutral. I repeat this for five to twenty minutes and sooner or later it will run for one or two seconds with no power. When it runs (again, without power- can't even let out the clutch in neutral) for 10 or 15 seconds, then success is near. Suddenly it will respond to the starter with an instant start, normal power. It will start and run normally until parked for a few hours. Tried an ignition tune-up and replacement of the fuel pressure regulator. Doesn't appear to be entirely related to ambient temperature as it will randomly start fine when the thermometer is in the neighborhood of either zero or 30 F, though it does seem worse at lower temperatures. Any ideas?