Nice. Have you run it with the new coil yet? You know it doesn't matter what level/yrs you are at...it's the simplest thing sometimes the other day my wife asked me to go over the Volvo make, sure it had a oil and all that kind of stuff... well being that it has 330,000 miles on it... it was down a quart and a half or so.. never any oil light though and I know it works. Also had a rough idle... well the plug wires are new... plugs are new too. This Volvo mounts the coil high up on the fender by the firewall and runs a long coil wire 'suspended' between some ac lines and brake lines. Not touching a thing... but the wire didn't care, a solid arch jumped 1/2 inch to a brake line...duh..
I electrical tape wrapped x2 and slipped a slit rubber hose over it. Smooth idle.
I'm not saying that your coil is the fix per se maybe it is maybe it's just a part of a few failures that contribute combined detriment to its running right.