My Vauxhall Vectra Club Estate injection hesitates or misses when cruising at low revs
My Vectra Estate is 1.8 petrol injection and W reg. It starts 1st time every time, idles beutifully, accelarates well and runs ok at high speeds. If I cruise at low revs however, say 1500 to 2000 with just enough touch on the pedal to maintain speed the the car is very lumpy or perhaps misfires. The moment you either accelerate or take your foot of the accelarator pedal the problem goes away. I've changed the fuel filter and run injector cleaner fluid through but no change. Any ideas?