I've got a 2001 Astra mk4 1.4 16v, and I'm getting a few problems it
Recently the car Has been back firing a lot more than usual and jolting and jerking a lot and juddering at high engine speeds
It only does it between 2.5k-3k RPM, at low speeds ( still at 2.5-3k RPM ) the jolting and jerking is pretty violent and it throws you about almost, and at higher speeds ( still same RPM ), it judders and splutters.
I did a service not so long ago, Bosch Quad cores sparks, they're all in good and the gap size is ok, air filter element cleaned it and de-restricted it, oil and oil filter
I also cleaned the Throttle body butterfly, so it was spotless, it did make a difference
Also When I've given the car a good run in, for about an hour or so, so they engine is warmed up good, when I come to start it, It takes a good 6 or 7 turns for the engine to get going.
The engine management light has been showing, But this has been on for over 40k miles since my sister originally bought the car, and these problems have only started showing now
It has done 103k Miles.
Does anyone know what this could be?