I have a 1992 mazda mx3 it starts but it dies. What causes this

You can use VCM IDS for Mazda to have a check

This model the primary signal taken from the distributor,If the signal problem no high-tension generate. please check

If it was running before you replace the thermostat, check for ground wire's in the area you were working at, very important on imports.Other will still run, not imports.

The easiest way to rule out a fuel starvation problem is to remove the rubber air tube between the throttle body and the air box, manually open the throttle body valve and spray a short burst of stating fluid into it. Quickly release the valve, and attempt to start the car. If it starts and runs briefly then you are not getting fuel.

is the air filter full of s...

TPS

Before you replace the fuel pump, I would check the cheaiper parts first. Such as fuel filter and injectors.

i dowt it did u check the iac valve stands for idle air control valve or possibly ect sensor

nope diffrent trans man not to mention obd1 for 92 obd2 for 96 lots of work man not somthing i would call easy

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