I am having similar problems to this.  Never thought it was my dist
though, because when the car does start, it runs fine.  I have a 1994
Nissan Altima 240,000 miles.  Car has always had regular maintenance
and still runs strong, when it starts.  It does not like to start when
its cold, and now it wont start when its hot.
I do have oil leaking from around the dist, and around the valve cover
gasket.  Probably a half quart every 3 weeks or so.  It smokes a
little when it does first start, but not after its been running.  The
spark plugs have a little bit of oil on the threads after a few weeks
of being in the motor.  But the electrodes look clean with a grayish
white color after a few months.  Could I be having this cam sensor
problem?  If so where can I find it?  Or is it part of the dist. and
the whole unit needs replacing?

Thanks all

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Can anybody help???? I replaced the Distributor, the cap, rotor, fuel
pump, filter, temp sensors, injectors cleaned and a tune up and no
start. For some reason I think its flooding out. This problem only
happens in the wintertime for the past 2 years.