After sitting for so long, the throttle body and idle air control will be in terrible shape. Some of the vacuum lines may show signs of cracking, but that will increase the idle speed.
After a tune up and fluid change, including anti freeze and brake fluid, I suggest driving the car around 2500-3000 rpm for a good 30 minutes to clean everything out. That will also let the valves spin and wear evenly. Don't go to 5000rpm for a while :)
Do an additional oil change after about 500 miles or so. Then drive the car forever.
Klaus
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The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)
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