2001 ford ranger turns off when I brake or stop pressing gas. Why?

I turned my truck on after work today and it didn t turn on right away as usual. It took me a couple cranks and then I needed to press the gas to get it going. As soon as I let the Gas go, the truck would shake back and forth a bit before it turned off. I turned it on but I needed to put it in drive and press the gas in a split sec. Before it turned off again. I m driving and I press the brake to make a turn, it turns off, the steering wheel and brake lock on me! I freaked out. I put it on neutral and turned it back on and kept going. It kept doing the same thing again and again. What is it? Please help.

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