Another poor idling thread.......

[Magnum44]

Ok, on my way to work this morning I stopped behind a lorry, revs had dropped to about 200rpm, so i gave it some throttle to get the revs up again, but then once I started moving again I coul feel the engine being slightly hesitant mainly between 1000 an 2500rpm, I've cleaned the idle control and throttle body recently, new spark plugs 6 months ago, new ht leads and coils, new MAF. Could it be my lamda sensors that are maybe causing this and if so, which would be the likely culprit?
Any help or suggestions would be great.

[chomerly]

Without getting a code reader on the car mate you'll struggle to know for sure.

If you haven't got the lambda warning light on the dash i doubt highly that would be the cause.
My car had two heater sensor circuit failures for my last readout and my car never did what you are describing.

I'd get an OBD2 device on it and use realtime monitoring software that you can watch while you get someone else driving it.
One thing that i have learned though is that if you do not have a genuine Volvo MAF it will make your car idle and drive like a pig.
The one i bought to test my car out gave erratic lambda sensor readings like i've never seen before.

Get a diagnostic reader on it first before making any assessments on what needs to be changed.
It will give you an idea on where to look and can narrow it down to one, maybe two parts in particular.