Year make and model helps. Newer cars the A/C controller is a computer. It is connected the all the others by data lines. When you put the blower on high, a relay switches directly to the battery(fused). The controller is no longer in play for the lower speeds. The controller can be scanned on newer vehicles. My first guess would be the controller is bad. But I check them out. Any computer on a vehicle that shorts out the data wire will affect all the other computers. If it is a dead short, the vehicle will not start and will not be able to read codes from any of them. The controller for the A/C is the buttons you push and knobs you turn.
It's a 98 Suzuki esteem wagon glx.
Your's isn't a computer. But you still need to find out why the blower control is affecting the engine. You'll need electrical schematics. I would find the power wire ( for the controller, not the blower) coming from the fuse panel. Cut it a few inches away from the fuse(in case you need to rewire it). Take the wire to the controller and hook it to a longer wire and run it to the battery. Start the car and turn on the blower, If the problem is gone, Your fuse panel is shorting out. If it still there, I would do the same for the blower fuse/wire. These are only two places the the controller can affect the engine.
Just a question. When you say heat on high. Is that the heat turn all the way up or the blower at top speed. There are two different answers to those.
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Surely your question should be why does my car jerk in the first place
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I've taken it to 3 mechanics and each one had a different answer. Either the type of gas being put in, the first cylinder is misfiring due to the engine coil or its a sensor. That's why I thought I would ask this question instead, but thanks anyways Steve Mason.
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