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Q: trouble started as a P0401 EGR Low Flow on 2001 Ford Escape

I changed all the vacuum lines, changed the ERG, and solenoid pump. The truck stumbles once i put the vacuum line on the ERG valve(runs smooth with out the vacum line on the EGR vavle). Can anyone suggest a system to look at?
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If you're getting constant vacuum to egr at idle , maybe wrong vacuum line or control signal problem.
Now, try switching vacuum hoses at EGR control solenoid. The black thing with two hoses and wires going to it.
Like next answer suggest wrong hoes to EGR.
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