Most likely your air suspension bags (or the pump) has failed.
Souns like a head gasket to me.
Try a new switch or just clean the contacts on it
Yes because what if the first plan doesn't work, back fires, or goes COMPLETELY WRONG. of course, just in case your plan a goes a bit wrong.
Only if you close your mouth and swallow it goes back down
Either your coolant level is low, or you need a new thermostat because it is stickig, intermittently
what is wrong with my rpm it goes up and down
Try unplugging it for one min an plug back in. That should reset it.
Sometimes when a person eats or drinks something, it may end up down the wrong tube or pipe. What this really means is that if you are talking or laughing as you swallow the food or drink, the larynx can be a little late in closing off the airway to seal it from intrusion. If this happens, a strong coughing reflex will occur that will help bring the food back up into the area it is supposed to go.
yes
It is the bone that goes down your back and to which your nerves are connected to.
subduction zone
Hydrogen & helium