First off, this car has no carburetor. It is fuel injected. Do you mean a new throttle body?
Secondly, did you visibly check the brake fluid? This car should have an opaque brake fluid reservoir on the master cylinder, so checking the fluid doesn’t require getting your hands dirty.
If the fluid level is near Min, add fluid will probably turn the light off. But, you may need brake pads soon. As the brakes wear, fluid is used to take up the loss in pad thickness. Most of the time, when the light goes on due to low brake fluid, the pads are almost fully worn out.
If the fluid is near Max, your having a potentially dangerous brake problem and should have a qualified mechanic look at them ASAP.
To answer the questions,
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High idle can be caused by a vacuum leak, a sticking Idle Air Controller, or an engine that doesn’t heat up properly. Only a proper diagnosis can find the problem.
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If you must ‘floor the gas’ on a fuel injected car to get it to start, it is usually a sign of a flooded engine. This is most likely due to a leaking injector. If it happened just the one time, it’s maybe not a real issue just yet. If it happens frequently, you’ll need to get this fixed. It should be easy to find the bad injector by looking at the plugs after another episode.
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Depends on the problem. A broken vacuum line is cheap. A new IAC may be costly. Just cleaning the IAC and Throttle body is cheap. A cool engine may be due to a bad thermostat, which should be cheap.
I’d have these issues diagnose and a price quoted before condemning the car. You may have been swindled on the rebuild, but 40,000 miles ago, that’s pretty much a lost cause. These new problems may be dealt with quickly and inexpensively.
High idle can be caused by a vacuum leak, a sticking Idle Air Controller, or an engine that doesn’t heat up properly.