Vibration you can notice is not a normal feature of teh 5 cylinder. As noted, the upper torque bushing is an obvious thing to check, since this is always failing and easy and cheap to fix. Next check is the "front" engine mount, located at the front of motor, but physically on teh passenger side of car, down under the pulleys that run serp belt. In my experience, that transmits more vibration than the torque bushing when it goes, since engine sits down on the sub-frame without benefit of the rubber isolation of teh mount. The upper torque bushing is easily checked. It is at the top, rear, center of engine, inside a stamped metal bracket bolted to firewall. Push the bracket side to side with some force and see if the outer ring of rubber moves more than the center section. There are just a couple of rubber connections between the outer and inner sections, and you can usually see cracks in those indicating that the bushing is failing. Front mount requires getting under car and using a long pry bar to try to raise engine right beside where the mount attaches to passenger side rail. Movement of an inch or more will be enough to say the mount is failing, even though it is going to still keep the engine in about the right position for quite a while longer, just resting slightly olwer on teh sub-frame. That mount costs about $25, and less than an hour to replace. the Torque bushing is about $11 and a half hour (need to jury rig some hardware also).
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Mike Sullivan ('91 745 (184k), '95 855T (70k), '98 V70XC (83k). Past Volvo's: '85 744 (256k), '86 245 (165k), '86 245 (195k), '88 745 (208k), '93 965 (147k) .