My 205 Mi16 (1.9 version running Motronic ECU, reangled standard manifold) has started to sound a bit agricultural on idle. I've attached an audio recording of it, with the mic placed behind the exhaust. The engine itself doesn't sound unusually noisy, but the lumpiness is noticeable. It sounds OK when revved as you'll hear in the recording. The roughness can also causes lots of vibrations in the car too, so I tend to give a little gas when stationary to lift it to 1500rpm or so to make it smoother and less annoying.
Spark plugs and distributor cap & arm all seem fine, and are relatively fresh.
Any ideas?
Exhaust_180403_mono.mp3