Quote:
Originally Posted by blackestate
Had this happen on a 7.3 and it was a dropped valve.
I would pull the valve cover and take a look see if you have a broken pring soe something causing the valve to not seat.
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Thank You.
JonL's statement " A little suction like that probably isn't abnormal. " is not correct. Detecting a suction at the tailpipe is an indication of something wrong. I have seen it listed in old books as a diagnostic step.