It completely quit and I gave up on it for a few months. I'm now needing a vehicle (besides my '81 chevy 1 ton) so I've drug the old mazda back out. I just had the computer rebuilt, which fixed a lot of my problems, I also replaced the PCV valve/vent and grommet since the old one was falling apart. The distributor was also replaced due to broken off screws in it, also replaced coil, plugs, plug wires, fuel filter and the previous owner replaced the injectors. The pickup has great fuel pressure and spark. It is also perfectly in time. The pickup fires right up with no hesitation (even when it's cold out) and it runs for 5 to 10 minutes with out missing a beat!. As soon as the thermostat opens and the top radiator hose starts getting warm the pickup misses out a couple of times and then quits. There is no smoke or anything out of the ordinary. When I try to restart the pickup it fires and tries to start but it "can't keep up". When I let off of the key and try again it then doesn't even fire???. When the pickup sits and is completely cold, it does the whole thing all over again.
I'm thinking it might be the Coolant Temperature Sensor, I watched a youtube video on how to check them with a volt meter, so I'm going back to the shop tomorrow to test it.
Does anyone have any ideas on what this could be?
I have a couple friends that are good mechanics and they don't know what it could be?.
Thanks for any info