Hi all,
1991, 940SE turbo has idle issue as it idles so rough at any given temperature or other conditions that the whole car shakes badly. I tried everything listed but to no avail. The mechanic condemned engine, but I doubt it as the compression of all cylinder is within range. I was in the process of checking the timing belt if it had skipped any teeth. When I was going to install the crank pulley holder tool that is put in the pulley and tighten to the idler bolt, I noticed that the tool is off the mark and cannot be tightned as it is made to be tightened at the idler bolt. I had to rotate the pulley backward to make the tool to reach idler bolt. Please advise if something is wrong here or that is normal. I stopped opening further and will do after getting some advice this weekend.
Thanks
Ram

Not to sound off base here but did you look at the basics first? Plugs Wires Rotor, Cap, Throttle body cleaning?
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'75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.no.net/ebrox/Tony's%20cars.htm

I noticed that the tool is off the mark and cannot be tightned as it is made to be tightened at the idler bolt. I had to rotate the pulley backward to make the tool to reach idler bolt.

It's not unusual to have to "fudge" a bit to get the tool on the idler(?) stud. But how far "off the mark" is it? If more than, say, 1/8", the outer part of the Harmonic Balancer pulley may be starting to slip on the thin rubber layer that bonds it to the keyed inner hub. Draw a line with Wite-Out or similar on the pulley face to see if the outer-inner relationship changes.

I've seen that reference as much as 60°-70° off, and it could mean trouble sooner or later.
See second paragraph here.
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.