Can someone answer this question? For last two days my 5KTQ has periodical erratic idle, hovering at times between 900 and 1100 RPM. I replaced O2 sensor about a year ago. Could it be due for replacement? TIA, Efraim Gavrilovich 1988 5KTQ 335,000km (208K mi), 1.8 Bar 1990 90 111,000km (68K mi) Vancouver, Canada