Just changed the sparks on my 2.0l astra turbo (2001). As soon as i changed it, the acceleration became very slow. I could plant my foot down, and then 5 secs later the revomoter would increase really slowly. Theres a lack of air i think as the dump valve can't even be herd properly.
So i put the old sparks in and it was the same problem. Then half an hour later it started working normally. And now its gone back to the slow acceleration.
I've doulble checked all the wires, theres no loose wires.
Any one any ideas?