timing off,base timing not set,dist. not set in right position, timing belt about to break, low fuel pressure,burnt valves,leaking head gasket.need more symptoms.
on the upper left side of youre firewall
The cause of your 97 Galant idling fast and then slow is a high idle system, either electrical or mechanical. Basically works like this: when the car is cold, usually in the morning, the system will cause the idle to be higher than normal to help heat the engine to normal operating temperature. Once that temperature is reached it will then kick down to a slower idle. Both idle speeds are preset by the factory. This is common on all vehicles, not just the Galant.
A clogged fuel filter can cause a Mitsubishi Galant to idle rough for the first 10 minutes it is running and then it runs fine after that. A fouled spark plug can also cause this issue.
bISS iDLE SCREW ON THE THROTTLE BODY
Yes, it sure can.
underneath the throttleboby
Attached to the intake manifold
The computer has either forgot how to controll the idle, usually caused by a weak battery, or the idle control motor has failed.
The idle control solonoid probably needs cleaning. Remove it from the throtle body and clean it.
Possibly a bad idle air control valve...if you have a check engine light on, take it to auto zone and they can check it for free. If not, take it to a mechanic
Yes if it is stuck open.
Idle speed set too high most likely. Also could be carbon deposits inside cylinder. There are a few other option, but the cheapest to check and fix is idle speed.