Hi guys, Wondering if you can help me with a problem which nobody else has been able to so far. I have an a4 Cab 2.0 TDI and between 2000-3000rpm on a slow accelerate, the engine jerks a little and starts making a hissing/sucking sound. If I floor it, this doesn't happen but only does on slow-med accelaration. I've taken this to Audi and several other garages and they have run a scan and nothing. Someone said it was the fly-wheel, but it wasn't, others the EGR Valve, it wasn't and the problem continues! SO this is just a post to see if anyone has had this before with the same symptoms and could possible shed light on to the problem? Thanks!