1997 ZJ 4.0 cuts out once in a while

[SteveTheFolkie]

1997 ZJ - 200K on the clock - every once in a while, at a stop light or sign, the revs will drop and, if I don't pop it into neutral, die.  Re-starts at once.  No impact from weather (hot, cold, dry, wet, it'll die) - no CEL thrown, performance is the same as it has been since I bought it at 150K - plugs fresh last summer - might replace the cap, rotor and wires just to be sure.  Ideas?

[SteveTheFolkie]

pulled computer, removed cover, cleaned contacts, re-soldered 3, re-installed, cleaned plugs, applied dialectic grease, hooked up - driven about 500 miles so far - no issues.
Also replaced a knackered left front u-joint while I had her down - half the needle bearings were gone!

Maintenance, maintenance maintenance!  Currently at 204,000 miles - shooting for 300K!

Cheers

Steve