Ihave a 92 olds 88 royale. car idles high on start up and starts to over heat

Have the ignition control module tested ! GM Type Ignition System Troubleshooting Diagnosis and Repair by Wells EM

It's piggybacked on to the starter.
1992 olds 88 royale starter solenoid Google Search

Also, check the neutral safety switch - Put your foot on the brake and put the car in neutral. Then try to start it. If it starts the neutral safety switch is bad. It could be the ignition switch. It could be to starter solenoid. Does it have an inertia switch? They rarely go bad but I have seen it.

check your wiring harness that plugs into the coil pack and see if the wires are melted or showing. i have a 92 and the wires melted together and it was doing the same thing and it also could be your coilpack or your ignition control module (icm)

You might take a close look at all your vacuum hoses for a leak or crack. This problem will cause the RPM s to run high.

I HAD A OLDS ACHIEVA AND IT WAS BETWEEN THE DOOR AND DRIVER SEAT ON FLOOR AREA . CHECK THERE OTHERWISE SORRY I COULDN'T HELP. GOOD LUCK !

Lots of possibilities.
If the alternator was not putting out 14 volts or more when reved up, then the battery could be draining as you drive.
But then you would still get a click from the soleniod, and jumping would work.

My best guess would be dirty battery terminals, since they can rapidly change with chemical reactions. They should be taken off, brushed shiny and greased.

But starters can fail from heat.
Another possibility is a safety switch could be bad, like neutral safety or clutch safety switch. Try neutral instead of park.
And the anti-theft system is also possible.

car starts and idles good.it cuts off while driving,and starts right back up????????

I would check the crankshaft and camshaft sensors. I don't think the connections are wrong, they really only go on 1 way.

start with flushing your heater hoses and heater core to make sure that there is not blocks

bad rod bearings time for a new engine