A gauge does not idle, please rephrase and re-ask the question.
radiator leak. try adding " leak stop"
no
Yes. It also depending on what kind of stop leak and how much is used.
probly bad gauge or loose wire buy a manual gauge one with the oil line right to the gauge nothing is wrong. the guage is supposed to be high when driving. it will drop when you stop or are idling.
Possibly fix the vaccuum leak !!
A common cause for a gas gauge to stop working in a 1994 Ford Aspire is a defective fuel gauge. Lose wiring in the dash is another cause.
It is the idling sensor on top of the intake
Could be an exhaust leak close to the engine or a bad catalytic converter. It also could be a bad mass airflow sensor.
it has obd2 you need to have it diagnosed as there are at least 5 differant parts or sensors that could cause this
probably a vacuum leak
change the mass air flow senser
Repair the pipe of fixture to stop your leak.