I did my idle air hoses last year... it was quite an easy job. But, if I do it again soon- I'll pull the whole injection head off the car and replace all the rubber parts.
For mine, I use to squeek through emission testing until I replaced the temp sensor on the head for the FI system. It leaned things out a bit.

86' model, 130,000 miles.

MBUSA now sells the Beru plugs but my dealer still had the non-resistor Bosch instock.