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Check the plugs, if they are black with soot, save them for cleaning and put in a new set of Bosch WR 7 DC, gapped to .028" which is the plug and gap for my 1988 244 which has LH 2.2, whereas your car has the LH 3.1 (I think) and the spec may differ.
In any case, the specifications section of your Owner's Manual will have the correct plug and gap spec. You can get an Owner's Manual at 1-800-25-VOLVO or at www.volvotechinfo.com.
After testing the above, get a new throttle body gasket, and pull and clean the throttle body. Be careful of getting cleaner into the throttle position switch. The TPS switch must be check and adjusted so that it clicks just when the throttle plate gets fully closed. While you are in that neighborhood service and check the flame trap, too.
Check the Idle Air Control unit. With everything off, pull the harness off and check with an ohmmeter for continuity between each pair of terminals. Any showing open circuit means (1) check again, and (2) the IAC is toast and must be replaced. If continuity is OK, pull the IAC off and clean the mechanical end. Hold it with the harness connection up, and use carb cleaner spray through the opening on the mechanical end. Shake it to be sure the piston is free moving.
Reinstall all that and test the car again.
Post back with your results.
Good Luck,
Bob
:>)
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