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I would like to disagree on the computerized cars being difficult to diagnosis. You can buy the computer to read these codes from your car for less than $150 dollars. That is less than one trip to the shop. Quite often it is a sensor that can be fairly easy to replace. On the other side of that, I always buy the sevice manual to help find these sensors. They can be another $100 to $200. With the computer it can tell you which spark plug or spark plug wire is bad. A lot easier than the old way to find a miss. This narrows it down quite a bit.
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You got that right, Bob. All cars sold in the US since 96 have
to use std data connectors and mostly std error code info.
They call it OBD2. I have an Auto XRay 4000 that allows me
to read and reset error codes, as well as monitor how the car
is running. SOME of the codes are manufacturer-specific, but
you can find what they mean with a litte web searching. I
have used my scanner several times, cuz I was foolish enough
to buy a BMW (my first and last). Anyway, repairing cars is
actually easier now, in some ways.
----a dedicated DIYer for everything.