Originally Posted by stevieturbo

Give history....sudden problem ? after work ? other ?

when engine is warm, normally after about 10mins

It is extremely unlikely a faulty ecu.

you would be surprised had all sorts of issues with other makes, but i have no way of testing

Firing the parts cannon is rarely productive.

sofar all the common bits done, coild packs were worn, and plugs new plugs didnt hurt

Air leak is very possible.

Ive checked all the vacumm lines and the inlet manifold has had the seals replaced just to be sure

View live data and see if idle control is actually active.

not sure what you mean here, there is no idle control valve and the requested rpm is low which is why im thinking bad map, car was dead when i got it with a blow head gasket, thats all been done, valves tested, head skimmed

It could be a bad map, but why would that happen all of a sudden ? That makes no sense, unless you have recently had it badly mapped ? Again, history matters.

its always done it as far as im aware

And unplugging the DBW unit isn't limp mode, it's totally disabling the throttle's ability to do anything, except sit at its natural rest position. So proves nothing whatsoever.