Missing vacuum line.

[captcorvette]

Have been chasing vacuum leaks, inept (me) mechanic, bad advice from local agencies, missing issues, VATs issues and much, more but slowly making progress thanks to the help, explanations and experiences of many of you. Seems like this is an adventure in "what comes next?".

Chasing down possible leaks one by one when at least one item came to the forefront. Have had the ECM off and on adding piggy back chips, checking pens, looking for any possible damage etc.. Then like the old "forest for the trees" I notice the vacuum line on the bottom of the ECM is gone. Yep completely gone. The "L" fitting is there on the bottom of the ECM housing but no hose in site----any place. Will now have to wait until I get home this evening to break out the FSM to try and backtrack from the ECM to where the hose pipe should be but there are no obvious hoses or pipes that are not connected to any area I can find.

Good thing I like puzzles. But perhaps this is a further sign of progress. One of the reasons I don't like to let anyone else ever work on my toys but sometimes we are forced to let other get their hands in the mess.

Any ideas out there as to where the pipe/hose has gone? How it could be gone without even a remnant remaining?