Hi. I have a 2007 VW Golf 1.6 BSE and idle is not stable. I get random misfire on all cylinder. I also have a black spark on cylinder 4. No fault codes. Some time ago I got misfire on only no. 3 cylinder. Changed plug wire and spark on that one. Nothing changed. I also tested with other 2 ignition coil - block type (used) and no change in idle. On 032 block I have around 8.5% on first field. I don't know what to do.