2.2CTDi errattic behaviour, no codes, garages useless

[NiallN22]

Hi all, just wondering if anyone can give me some help and advice here as I've tried a few garages so far and gotten nowhere.

My engine has some strange/erratic behaviour on light loads - Sometimes it will stutter/Kangaroo before coming to life, other times it will have almost no response to the throttle initially then when you press it a little harder it revs frantically like its running away. This only seems to happen within the first half inch of pedal travel, so what you use when pulling away gently in city driving and slow cruises.

At heavier loads i.e. accelerating with more vigour or faster cruises say 50mph+ these faults do not occur. It is only in stop/start driving conditions and town speeds that it happens.

 

There are no engine lights on, I took the car to a Honda specialist who scanned the car for stored codes - Told me there were no codes and they could not replicate the fault (they didn't actually take the car out properly to try and recreate it).

I've rang around a few other garages and even asked a local rolling road if a live diagnostic run on the rollers might reveal anything.... All been totally unhelpful and said basically the same thing, if the computer isn't showing what the fault is we don't want to touch it 🙄

 

Can anyone give me some help or advice on what this could be as its driving me mad and makes driving in town a fraught experience when you are trying to pull away and either bog down/almost stall or charge away with a squeal from the front tyres.  I feel like it must be an electronics fault somewhere because of its transient/intermittant nature but beyond that I'd just be throwing parts at it out of guess work and hoping for the best and I really don't want to do that.

Any help much appreciated!  Cheers

[Trevor]

At first I thought it sounded like a slipping clutch which gives those symptoms but if it is throttle control then I would look at any connectors on the throttle pedal for contamination or water ingress