Thank you for your help in advance…

I have problem with my car.
Since yesterday, the engine stops when it was stopped after slowly driven.
At first, it stopped in front of the gate of my apartment.
I slowed down and stopped behind another car and then I stepped on the accelerator but it went backward (I was on slight slope).
So I puzzled and pushed brake, and I found out that my car was turned off.
I restarted and slowly drove.
But it turned off again when I stopped the car just few feet away from the gate.
And today, it happend in front of the garage and cross road.
It didn’t happened when I drove fast and there’s no problem when I start up.

I really have no idea.
What is wrong with my car?

Just in case…
it’s 1998 mazda, 11*,*** miles, timing belt and front brake pad were replaced few months ago…

I’m wondering if it’s spark plug problem. If so, how can I check the plugs whether it’s worn?

make sure your battery connection is clean(without any dirt), change air filter if you have to, and maybe fuel filter as well.

thank you for your answer. hmm, i need to find a mechanic or wait for my friend -_-;;;