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sounds like a vacuum leak, look & all ur lines make sure none are un hooked or broken, if that fails take a can of throttle body cleaner & spray along the intake & ur vacuum hoses till it stays runnin
& pay attention to where u are spraying so when it stays runnin u know where the leak is, sometimes the rpms may even raise up when u find the leak also
not 2 sure on the 3.0 there should be a port on ur fuel line on the intake somewere that looks like a valve stem that is were u put a fuel gauge on it 2 check it