Need some input on a stubborn problem that is becoming very annoying. I have a 1985 500 SEC, only 215,000 and runs like a top. (21+ mpg!) (one quart in 5000) {Yes, I am bragging about it.}

However, the engine is ususlly VERY stubborn about re-starting after sitting 10 minutes to 3 hours. First thing in the morning, fires right up, regardless of temperature, after it sits all day at work, fires right up, regardless of temperature, if driven and shut off, say to fill with fuel, fires right up. But, give it 15 minutes and it is very difficult, skipping sometimes on more than one cylinder, sometimes requires re-starting, seems to be flooded. Once started, rev to 1500 or so, it clears and smooths out and runs fantastic.

I am open to suggestions? Thanks in advance.

(Also, sometimes when it is tempermental like this, the fuel pump sounds like it is cavitating, this usually abates in a few moments, but not in sync with the smooth running of the engine.)