This is a very generic answer: You have to feed it enough gas so that it can run. For many reasons if the amount of gas going in isn’t enough to keep the car running it, it dies out. The chugging is sorta like it’s getting just enough, then not enough, but wait there’s enough, but no not enough and at a certain point the min amount of fuel isn’t provided in time. This can happen if there’s clogged fuel injectors (or carburetor) or if the load is too much and you’re not pushing gas pedal enough.
There are other reasons it can stall but this is the most basic.
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