My mazda mx 3 idling high

Does it stall out because the engine is idling slow? Have you scanned the system for codes?

have you cleaned air filter, checked spark plugs. always look at the small things first, ask your garage for a blow by test to see if you have compression problems could also be head gasket any timing issue would result in a very rough idle.

there is either a vacuum leak,or a valve on the throttle body called an iac that is bad. it is the idle air controller.alot of mazda have that problem

The butterfly at the air intake may be dirty. If at all possible remove the breathers leading to this and clean the butterly with carbuerator cleaner or something like it. There may be deposits and it is not breathing good.

You should check your engine's AIR hoses that are connecting to the airbox. sometimes a simple airleak will be enough to alter your idle. Specially when its cold the car will already idle rough ( I know im canadian lol). So go check your air hoses ;)

sounds like the tps is bad or idle control motor

your throttle body is dirty and needs to be cleaned- also, you might want to check the spring and the various parts on the throttle itself for wear and tear.

the intake for air and the flutter wing could also be hanging up inside the air intake

The Throttle screw is located on the throttle (obiously) its in a clinderical shaped channel located on the throttle just oposite or obliquely opposite the the throttle body position sensor. In some mazda vehicles (IN TRINIDAD) you need to loosen the throttle body position sensor and slightle adjust it eighter to the right or left to tuen the idle (For electronic controlled axcelleration) in some cases it can be adjusted via an ODB2 diagnostic tool (only in some vehicles that has electronic controlled axcelleration)

You can tell what type your vehicle is by looking for an axcelleration cable connected to the throttle body. If the throttle body has a cable it isnt electronically controlled and has an idling screw. If there is no cable but wires to the position sensor its electronic.

here is what you need to do, a cleaning of the intake throttle blade and the idle speed control air-bypass valve, they get full of gunk over the miles and cause idle issues (stalls) like yours,
Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

check the oil filler cap i know this is corny my does the same thing if its loose or off