I was getting some coolant in the cylinders 1.5 years ago. Valve seals were changed. Head gasket changed. Plugs were changed and were clean when I last inspected them (about 4 months ago). No leaks apparent in vacuum system, although I haven't had the vacuum level checked. Are injector seals easy to check?
I've heard a leaking EHA could be the problem? How do you check it?
All my problems exist ,hot or cold. This makes you think the o2 sensor is not the culprit?