Kenneth1948

New to the board and new to the Marque. Just purchsed a 1990 Legacy. One family since new, approx 155k miles. Seems to run well above about 2000 rpm. Seems to have good power and acceleration but idles very rough. Maybe on 2 - cylinders and shakes around a lot at idle (hence the Harley analogy) also has an unusual exhaust note at idle (not the normal flat four sound) just like a Harley, it's the best description I can come up with short of attaching a sound byte. I will start checking it out this week end but wondered if anyone has a good check list. A starting point from experience. It supposedly had plugs and wires recently. Could be an injector(s)? Is there a common source of vacuum leaks (must be a big one)? Could it have a burned exhaust valve or wrong clearance? No smoke from the exhaust No knocks or taps (almost too quiet!) Any assistance would be appreciated. Thanks, John aka Kenneth