MAZDA MX3 1.6 recently have very high RPM when it is in idle. What shoult I check?

Question

Problem is from time to time, sometimes the fully warmed engine runs at normal idle RPM (below 1000), but sometimes idle RPM is above 1400) (at the same conditions)

Answer 1

Feather your gas pedal to see if that lowers your rpm.  If not pop your hood and spray a bit of lubricant on your throttle cable to see if that could be the problem.

Answer 2

s***w your idle s***w anti clockwise until the rpm goes down.