[Aussie Wonder]

Have same problem. What was your solutions?

To be fair, I have replaced;
water pump, thermostat and timing belt
ICV (replaced)
new O2 sensors
all rubber vacuum pipes
All the filters - air, petrol and oil filter (new oil, all changes to service intervals)

Full service of injectors - which makes it a consistent high idle - no longer rough

Spark plugs work fine only 10000k - also has very strong acceleration.

items left, and getting more expensive
thermostat issues - checked and seems to give correct resistances
MFTS - but that doesn't feed the ECU???
Throttle potentiometer and idle switch - checked variable resistance (need ranges confirmed 800 - 2500) and switch is working on/off
ECU - not getting codes using LED in fuse box. not even 4444??


This engine does not have EGR system. No valves of things to worry about here.

Engine starts and idles 1100rpm while cold. Normal warm-up.
Once warm, it idles 1300rpm +/- 100rpm, and does not drive easily, surges at low rev speeds. Similarly, deceleration is non-existent.
Cleaning the injectors took out the lumps in the idle, and has made it silky smooth fast idle when warm.

Any pointers please.