1995 Galant Idels between 1500 and 2000rpm.

Could be:

1. Throttle not returning to idle position due to mechanical issue (sticking);
2. Leak in intake manifold due to crack or other issue;
3. Open vacuum port;
4. Failed PCV valve

combination of emissions controls and ignition control issues and mine which is a 91 does the same exact thing because the defrost controls cause the engine to rev up high then slow down.. I disconnected the ac compressor so it does not come on..mine has some vacuum issues that I have not corrected yet but as old and as many miles as is on it Im gonna leave it alone until the motor blows up ..it smokes now and has over 300,000 miles on it.. rebuilt twice..5 head gaskets..6 timing belts and even when its really cold outside, it will start up when all my neighbors' cars wont..funny as heck..

If egr valve is stuck open can cause raunchy smell from exhaust, hense high readings. usually this causes rough idle though.

that is your idle air control valve. it is located on the throttle body next to the throttle position sensor

Did you install new spark plugs? Definitely replace the O2 sensor.

the iac probably has carbon built up around it this controls the idle speed try cleaning it first,if not it could be a bad iac or a vaccum leak that the iac takes some time to compensate for to control idle.

What type of car???? could be something in the computer/engine control system. if its a late model have it checked out could get worse

Some cars have a different fuse on both high beams,one for lst other for right.

sounds like a vacuum leak check hoses and manifold

Clean the MAF (mass air flow sensor.)Follow the hose from the air filter to the air flow sensor.Use a proper cleaner rated safe for this purpose.