Re: Rough/jerky running, related to exhaust leak?
Coincidence, my front pipe cracked the other day and started blowing badly. The leak was before the lambda and I could tell the difference straight away, car was lumpy at low revs, down on power and generally running badly.
Seemed to be running rich to me though :/
.... lambda detects higher oxygen level, thinks it needs more carbons and tells the ECU to richen the mixture?
Replaced the pipe today and the car is much smoother to drive and much zippier about 3-4k rpm.
If you've a leak before your lambda probe then it will definitely cause running problems.