AKL 1.6, just bought it last week (103,000km) and I'm ironing out the issues with it one by one. This one has me a bit confused.
It won't always do it, but sometimes I'll be idling and notice the revs are oscillating between 900ish and 1100ish, or thereabouts. Never acts like it'll stall, just acts like I'm blipping the throttle every half second or so.
Timing belt is very due for a change, but I can't imagine it's related to that?
I did just replace the coolant temp sensor, which revealed the thermostat is boned as well, could it be tied into that somehow? Otherwise, MAF, vacuum, throttle body, spark?
Some googling around makes it sound like I'd be very well served to take off my throttle body and give it some love with carb cleaner, I'll do that this weekend. Maybe tomorrow after work if I can get a gasket. That having been said, still open to suggestions on what else to check.