Have an '87 Nissan 300ZX 2+2, (Non Turbo) with 160k.  I'm second owner,
as first owner is 10 years older than I and, consequently, had finished
his mid life crisis and no longer needed the vehicle just when I was
entering mine.  Bought it in '00 and have had very little trouble with
it.

Anyway, about two weeks ago, starter began to sound "tired" in that it
would always start, but just barley, at times, turn over.  Engine would
catch right away, but starter seemed like it was going to die during
the 2 seconds it was cranking.  Seems to happen more when vehicle is
hot.  Battery was replaced (3 yrs. old and prorated for 6) at Advance
Auto as their diag. showd "bad battery."  Took it back to them to check
alternator, and it checks out fine.  All other electonics work fine.

Does this sound like starter motor needs to be replaced or mabe
solenoid?  I've tried to find similar problem on the net, but seem to
find situations of no starter, etc., and not the "tired" starter that I
seem to be experiencing.

Any help would be appreciated.

Thanks!!