My cars RPMs go up and down when in NEUTRAL? HELPPP?

Ant

New member
I have a 5 speed manual mazda 97 626. Its a 4cylinder
Just a few days ago when i put it in neutral to stop the rpms go back and forth from 1000 to 2000, then when i stop it will go up and down a few more times then it will idle at about 1500, which is way to high.... Any help people??? Is it safe to drive? How fast does this need to be replaced.
I ran check engine codes and i only have one code (catalytic converter), not sure if its sensor or converter itself? I got the code way before the RPMS starting acting up tho...
 
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