help with noise pre-road-trip

[Wayne Cox]

Hey Guys-
Looking for some quick help.  We're packing Lisa's NX for a holiday weekend
road trip (900-1000mi round trip)

In the past the car has occasionally made a grinding / vibrating / rubbing
noise when letting off the gas.  I figured it was a worn out front motor
mount, didn't think much of it, and put off replacing it.  Now I go on a
9am beer & ice run (huhhuh) and find out she has failed to tell me IT'S
GOTTEN A BUNCH WORSE in just the last month since I've driven it.

Any ideas what it might be?  That disintegrated wheel bearing story
yesterday has me worried!  During the clutch job 6 weeks ago, there was no
sign of wheels or anything rubbing.  And I never replaced the lower splash
covers, so they're not a sore spot.  CV joints are booted, but 153K
old.  The noise only happens when letting off the gas, not turning, so it
seems to be a motor movement issue.  Help!  i thought I had all the "leave
your ass stranded" problems fixed on this thing, but now I'm worried!

    -Wayne    '91 NX2k - '93 NK2k - '92 SE-R (parts car?)