VW Mk 4 - 1.6lt injected. 190,000km. Very little maintenance ever done except for an oil and filter. Girl owner.
This is an interesting one.
The engine runs rough the plugs are all over the place but seem to be running lean in the most part, lacks power. Water temperature about normal on the gauge but does climb when at idle.
What (or how) does one diagnose this, any thoughts or do you need more information Ill try and answer.