I have 2004 mk1 Skoda Octavia 1.4 petrol.
It is fine driving but won't hold revs above around 1700 when idle. This only happens when the engine is hot. This prevents it being tested for emmissions and has failed the test.
The car has had new:
Crank sensor
Cam sensor
Upstream lambda sensor
Downstream lambda sensor
Knock sensor
PCV valve
EGR & throttle gaskets
Spark plugs
Fuel filter
Air filter
Oil filter
Oil
Second hand:
Fuel rail and injectors
EGR valve
Throttle .
Injectors EGR valve and throttle have been cleaned.
Throttle position has been reset.
No codes.
Anyone got any idea how to sort this out? Any help would be much appreciated.