Alright folks. Having a bit of a problem. I bought a vr6 about 2 weeks ago and for the last 4 days roughly its been slightly juddering under load but only in low revs. Very slight judder when accelerating. Also when it gets to the high revs there's less power than normal and I can feel the car trying to slow down even with my foot to the floor and it doesn't pull or have near as much power as normal. Ive changed the oil and plugs and fuel filter and still no difference. Really need help guys. Any help would be much appreciated.