Hi,

I have a question about my 1990 Civic. It has had problems recently
with bogging down, stumbling, and seeming to stall. It just set the
trouble code for the throttle position sensor. I was going to replace
this, but found out the sensor isn't sold separately, only as part of
the throttle body. A new part is $450 or so, a junkyard part is $40.

I have some questions about doing this, that mostly relate to the value
of the car:
- Is this something I can do myself, or should I have a mechanic do it?
There's lots of hoses and so forth on the throttle body and it seems
like it's easy to get wrong.
- What's the reliability of a junkyard part?
- The bigger question is the car is approaching 17 years old and has
263K on it. Is this really worth fixing?

Thanks in advance,
Derek