Power steering pump going bad had mine replaced last year and freinds truck year before, sit at idle and slowly turn wheel all the way left and all the way right and see if you can feel it like it is binding
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Electrical issue. The heat or air draws more current and the electrical system probably drops voltage below the threshold the electronic control module can handle. First check that the Alternator is charging correctly. When running the system should have 13 to14.7 volts measured at the battery. If you turn on the heat/AC and it drops significantly you have a current draw issue (most likely bad fan motor, or short) If the voltage is below 13 volts when the car is running your alternator is likely bad.
I have a 03 silverado and my truck did the same thing I had to change the distrubator cap and rotor button lets see every 6 months, They ran the air condition line over the distributor and the condensation from it rotts the inside of distributor
clean the IAC it is all you need to do. Battery voltage drops just because when the engine stalls it kills the alternator. Engine stalls beause the Idle Air Control (IAC) valve is dirt clogged. Uninstall the IAC valve, and clean it using electronic contact cleaner (3M will do). No need to spend anything else.
when you say car lost power bought a new battery.sound like alternator not charging battery.with car running your voltage at battery should be 13.5 volts or 14.5 volts it not alternators need replacing.have garage replace alternator if faulty because 1993 to 1994 cars if you disconnect battery car would lose memory causing car not to idle.the car will stall out at a stop light or stop sign whole lot.it would relearn itself but the stalling out dangerous around a lot of traffic.