1999 Buick Park Avenue Car occasionally and won"t star

First of all thank you so much for your donation. If there are no code's to go by and it is completely random then your going to have to when it stall's and won't start see if you have spark and fuel pressure those are the two most common reason's for that to happen. That way we know what direction were going in to figure this out.

Hi Lou,

thank you so much for your fast reply.

How can I check if I have spark or fuel pressure?
The car got new spark plugs last week.

Does this help somehow in determining the problem?
It just happened again. I couldn't start it for 30 minutes. When it cooled down it was fine again. Could it have to sth with the cars cooling system?

The mechanics said that sth is broken and I am leaking coolant liquid.

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To check for spark you could take a old spark plug and remove one of the spark plug wire's from the plugs and hook the wire to the old plug then touch the the plug to the block while someone cranks over the engine while you watch for spark. There is also a tool that hooks inline between the spark plug on your engine and your spark plug wire that light's up if you have spark. There like 6-10 it's up to you which way you want to check it. Fuel pressure is a little harder you can rent a fuel pressure gauge at auto zone there is a cap on your fuel line going to your fuel injector rail that you take off then screw the gauge hose tightly to the fitting. Then crank your car for a few second's and see what the gauge read's. Let's stick with spark first if you have spark then we will move on to fuel pressure. My guess is were loosing spark. New spark plug's won't help us narrow down the problem in this case. Were looking for loosing spark all together. Also what is sth that is broken and leaking?