Ok, alternator checked good but I got another one just in case (the thread on the back of the alternator was lose when we took it off and it seemed to have a small crack in it). Well, we put it on and the voltage did seem better. However, when driving it, it shut off again when I slowed down. I started thinking about it and this only happens when my ac is on. When I turn the switch from ac to vent, my volts drop below 13 and it almost goes dead. It does go dead and the fuel pump doesn't seem to react (sometimes) when I press the gas peddle but only whend the AC is on!! Also, when my lights were dim the other morning, I had the defrost on
cold sol the ac compressor was running. When I don't use the ac, the blazer runs GREAT!! So far, we have changed the rotor button, idle air control valve, throttle position sensor, ignition coil, alternator, and we had the ignition control module checked, and the throttle body plates cleaned. It does run so much better than it did one month ago. I am sure it needed the IAC valve changed and the throttle body cleaned. But now I am at a stand still. I think I will just have to take it to a 3rd mechanic!!! I am thinking this time it is more electric related than fuel related this time. Maybe a short somewhere in the AC system. Maybe O2 sensors?