well well what is wrong with mine bogging out then going like a widow maker. i may have the answer i can't find any wiring to what is left of the oxygen sensor, someone has been playing and i can't get my head round how well it went for the 30 mile drive home when i bought it, and it has just started acting the pillock
When my 13 yr old Trafic started doing something similar bergs - was often a slug at low rpm but ran well up the range - it was that sensor, or one of them (think there are two doing something similar on Renaults).
I took it to the local village garage and they plugged it in to their 'valise' (computerised suitcase) and gave me a diagnosis that confirmed what I thought
That was the cheap 10-minute bit - but the darn sensor, which lives in the depths of the inlet tract, was a couple of hundred Euros for a bit of nowt. The profit margin on some of these parts must be enormous.
When I discovered that, I let the garage order and fit the darn thing too, as the friendly grease-monkey does it every day and is suitably double-jointed. I don't and I'm not. Frankly, it was worth it despite my initial sulk, because there are times . . .