Hello all. Please forgive me if this has been covered and solved before. I've searched the threads but I can't see a 'solved' answer to my slight problem. I own a manual 2003 Audi A4 3.0 V6 Cabriolet (B6). I am having some strange things happening when I accelerate. Be it warm or cold, I get a very slight hesitation/sluggishness when I set off as I press the peddle down, this happens only occasionally. It starts off like it's driving through a strong wind but it does not feel lumpy of juddery. It lasts thorugh to about 3500 rpm and no matter how much juice I give it the sluggishness continues until after a few seconds when the engine suddenly picks up and the car roars off. The 'surge' part to this threads title is this. When I'm crusing and I press the accelerator 1/3rd - 1/2 way down the car seems to pick up with more acceleration in this position than at WOT. This is my first Audi, it's a lovely car but this is getting a little annoying. No engine lights what so ever. It's also had a recent big service at Audi that included the cam belt. It was doing it before it went in, but I totally forgot to ask them about it. The previous owner had a coil pack go on him and he gave me a spare one just in case. I thought that if a coil pack was failing the engine lamp would come on. I run it on 97RON with occasional REDEX shots. It's done 58k. I called Audi parts yesterday but they would not let me speak to a technician. I suggested a coil pack and they agreed it might be as the previous owner had a pack go on him, so he replaced it with a Europarts pack - he also left me a spare. Audi service told me that it does not sound like a coil pack...! 'Confused you will be' They also told me it would cost me £50 for them to diagnose it... I might buy a BMW again, they never charged for diognosis. The coil packs are the red topped ones. Can anyone help me? Many thanks!