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2002 chevy trailblazer- when traveling about 50mph engine with start to jerk as if its not getting gas- seems like it pulls back but does not die

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Location: Oregon
does the check engine light come on? It could be fuel pressure or volume. (pump, filter, strainer) you should drive it with a scanner on to watch your fuel trims. If you run lean or if when you hit 50 mph it gets really lean you may have a fuel starvation problem.

you might want to see what your throttle is doing when the problem happens.

without a scanner hooked up to see what your computer is doing, everything would just be an uneducated guess. is it electrical or is it mechanical? is it spark or fuel? is it injector pulse or restricted exhaust?

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