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With so little information reaching a solution is not likely.Does the fault happen every time the engine starts or only the first time? Does the engine run normal after the stumble? If it stumbles after every start a vacuum leak could be the cause. if it stumbles when first started turn it off and restart.If it starts as normal on restart. There is only one reason The coolant temperature sensor has failed. when this happens there will be a strong odor of gasoline. The computer meters fuel based on the signal it gets from the temperature sensor. when there is no signal it meters maximum fuel causing a slow rough first start and poor fuel milage.
An ignition misfire feels like the car is stumbling. Get it up to about 55mph and ease into acceleration, if it stumbles you might want to get a tune-up. If it stumbles at idle and gets better with acceleration, you might be dealing with a fuel delivery misfire(clogged fuel injector or fuel filter)
It sounds like you may have picked up some small debris from the bottom of the gas tank when you ran it empty. You may need to run a fuel/injector cleaning solution through the next tank of gas to clear the debris and consider changing your fuel filter too. Sea Foam is a great fuel additive and I recomment trying it full strength. Hope this helps!
The mechanic should check on the fuel pump and the Idle of the fuel pump . if the fuel pump is malfunctioning then you have to repair it.Then also the throttle if the throttle is being worn out or malfunctioning then you have to repair or replace it.The Idle should be adjusted because of the engine is stumbling .the reason why the engine is stumbling or the car over heats is that the fuel pump is not functioning good or there is a problem in the fuel pump.and also it is the reason why the engine light goes off when cold because of the engine problem is in the fuel pump.such fuel or is not entering or going to the engine.