A while back I was searching out a problem where my car would not turn
above ~1500RPM.  I finally got sick of trying parts (fuel pump, filter, air
meter) so I took it to the most recommended shop around.  They had it for
over a month trying to track down the issue.  It was setting a cam sensor
code, but they replaced it with one known working to no avail.  Upon request
I tracked down a used computer on ebay, thank you to all who helped, but
that also made no difference.  Turns out that a new scope they had purchased
finally revealed a lot of noise from the crank position sensor.  Replaced
that and ~$600 lighter I'm back on the road.  I had never heard of a crank
sensor going partially bad like that, only quitting completely.  Anyway,
thanks to all who offered thoughts on my issue.

Matt
'91 318is