car is totally standard big turbo.

Hi, my car is hunting at idle and at low revs.

On cold start up, the car is fine. although it idles at 1300rpm, which is a bit high. think i will need to adjust the screw for this 950 if the norm yes?

as the engine warms the hunting increases and at full operation temp its very bad. 900-1600 every 5 seconds!!!

a pain in the arse as the car is undrivable unless im accalerating and also very embarasing when in traffic. trying to drive at 30mph is near impossible as the hunting acts like in on off the accelerator pedel every 5 seconds, look like a learner kangerooing!

if i take the small vacum pipe of the inlet manifold then hunting stops!!!

so logically i replaced the map sensor as its this that the pipe leads to. but with no joy!!??

i have been told the idle control valve on the inlet a piston inside can stick. ive taken this off and left the bottom half/piston end to bathe in some engine degreaser.

i will put it back and see if theres any luck.

there doesnt seem to be any leaks.

has anyone had a problerm the same as this. any advise would be appreciated, as its such a simple thing but is making the car undrivable/ unsafe.