Thank you! FYI- Harbor freight has a fuel pressure test kit which has an adapter for a Bosch KE Jetronic fuel distributor (Adapter #17 in set [8mm - 1.00]). And for a reasonable price!

http://www.harborfreight.com/master-fuel-injection-pressure-test-kit-97706.html

Also I was just thinking about your "new car"...

Another thing to do since you just bought the car is to check for vacuum leaks. And clean every electrical connection you find when you come across them.

The vacuum hoses will get brittle with age and cause vacuum leaks. And I suppose especially in dry Arizona! Note the economy gauge on your dash is actually just a vacuum gauge. And that should be all the way to the left pointing to the white line at idle. Like this...

http://www.peachparts.com/shopforum/attachments/diesel-discussion/53230d1205607397-got-myself-economy-gauge-w123-lmn-215000miles.jpg

(And of course move to the right as you step on the gas.)

There are vacuum hoses running all over the place under the hood. The black rubber hoses are the ones which get brittle and need replacement.

When I bought my car, I just bought several feet of each size vacuum hose at the auto parts store (smaller sizes) and kept that on hand. Then when I would be working somewhere on the car and came across a brittle line, I could easily replace it. I don't replace the tiny hard plastic lines as those are in good condition on my car.

Anyway these cars are notorious for vacuum leaks if those hoses have not been kept up to par. Many Mercedes owners are good at maintenance too, so you could have all new hoses.

There are also vacuum hoses under the dash and are used for the air conditioning system.

Note the door locks are also vacuum operated - by a vacuum pump in the trunk. That is TOTALLY SEPARATE from the engine vacuum system.

Then the other thing is the electrical connections get poor with age. There are electrical connectors for this and that ALL OVER THE PLACE!

Anyway I keep a can of electrical parts cleaner on hand and clean each electrical connection I find as I work on the car. That can solve problems and also prevent problems.

Note that the factory service manuals will be in English, but the wire color abbreviations on some wiring diagrams are in German! Here is a translation...

BL blau blue
BR braun brown
GE gelb yellow
GR grau gray
GN grun green
RT rot red
SW schwartz black
WS weiss white
VI violett violet