Tries to turn over then wont let it sit awhile then it starts

Do you have a check engine on? If so take it to auto zone they can read your code for free and tell you what's wrong.

If it is turning over when it does not start, may be a fuel pump going bad. Gets hot and stalls out and won\'t start till it cools
down. Must be replaced. Check fuel filter as well. Could also be something as simple as a bad battery, starter or alternator connection... Corrosion is a bummer!

Year make and model ?
Have you checked fuel pressure ?

For some reason aleros have this problem every once in awhile. It might be the security on the alero. What you would have to do is turn the key all the way to accel i believe right before you start it and let it sit for about 13 minutes. affter this the security will recognise itself and start your car

Sounds like the starter to me(I assumed you meant won't crank when hot).I have replaced only 1 starter(on my neighbor's Taurus)in the 15 years after quitting the GM dealer tech job 15 years ago.I probably could make a career just changing GM starters and alternators.(I only have Mopars in my driveway!)

Check the electronics,cam sensor or crank sensor these are the culprits.

Battery is to weak & not holding charge. If the battery does not have enough power the starter will make a fast clicking sound or you will just hear one click.

Does it crank?If you shut it off and you restart after a few minutes and it cranks but won't start or starts and runs rough the injectors are leaking and flooding the engine. Need better description

i know industry jargon can be confusing, but lets try this. if it turns over but won't start, it could be your ''ignition module'' that sits on top of the vave cover on the motor or it might be the fuel pump or filter. make sure when you crank the engine that the key is all the way turned or it may not always make a proper contact to activate the ignition module. iv'e seen this before & had to change the ignition switch & all worked ok after that. i would need to know engine lt size to give you more details on the matter. please get back to me.

It could be a number of things. Have you tried to run any codes yet?