How come on my 93 pontiac bonneville 3.8 supercharged ssei, it takes a long time to start when its warm, it has trouble starting when its cold but not as bad, me and my dad in the past had put a new firing coil, spark plugs with wires, and a new radiator, also the supercharger isn't the original the previous owners bought one from a junk yard. The starter is fine
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Check out the fuel pressure regulator.
Check the tune-up specs, but don’t change anything. It’s probably way leaned out and timing retarded so it’ll pass smog with low enough HC and NOx. You could check it for vacuum leaks too.
It’s your Fuel.
Replace Fuel Filter. In an empty fuel tank, add a bottle of Chevron Techron additive at the rate of 1 oz/gallon. Then fill tank with a premium fuel from Chevron or Exxon.
Do that regimen about 3 times/year. Continue to buy a good brand of regular grade gas. About once every other month, fill tank with Premium.
This should help you significantly.
I have lots of experience with the 3800 series engine.
Since the engine is supercharged, you will benefit with running a premium fuel always. This will mean enhanced performance, cleaner emissions, and better mileage.
Check your starter voltage. Make sure you Have anti freeze. Also There is a fuse some people call a starter fuse(not the official name), but that was the problem with a car I used to have.