going up a very steep bend i stalled
An engine usually has a higher idle speed when the ac is running. If the high speed idle does not operate then the ac will cause the engine to stall.
If your engine is stalling when you push the gas from an idle or sitting still it can be several different things. The first thing I would check is the fuel filter. I would have it replaced. If that isnt the problem change your air filter.
the engine to stall and surge at idle
no
If the oil is low in your car, it can eventually cause your car to stall and not start. It can also kill your engine.
check your fuel pressure
Even a good EGR valve may cause an engine to stall in hot weather.
the tps is bad-throttle positioning sensor
The thermostat control engine temperature. If it fails the engine can run hot or cold - that would happen long before over-heating caused the engine to stall.
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A bad water pump can cause your car to stall if the bearing has failed or it is causing overheating. A seized bearing will put excessive strain on the engine and stall it out.