still get P1506..replaced the Idle control valve on 2003 Mercury Sable

i still get P1506..what could it be? that is the only code
that shows up on the scanner

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1 answer 1 comment
SOMETIMES WHEN YOU GET A CODE IN THE ENGINE MANAGEMENT IT ISNT ALWAYS A R&R PART. IT CAN ALSO BE A BAD CONNECTION.
thanks...where would i look for the bad connection?