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There might be a sensor that is shorted or bad. Whenever you unplugged your battery you are resetting the car's computer data that are use for reference to run the car. When the computer is reset it start to relearn all the data from the sensor from the vehicle. The will run but at it minimun performance. When all data are collected, the computer can operate the vehicle in the maximum performance. However, if there is a bad sensor the computer will be instructed to the vehicle to run in a limp mode or safety mode to avoid potential damages to the vehicle. An example would be if the car overheats the computer will shut the vehicle down by killing fuel line and thus prevent fire. My suggestion is to scan the car computer with a scanner and see for any failure codes. Good Luck

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Q: Fuel pump replaced twice only way to start Chevy silverado 2000 v6 is unplugging battery for a few minutes then it cranks up whats the problem?
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