can anyone help me with a problem that i have on my 2004 vectra c,there is a flat spot at about 1200rpm witch is worse when cold,feels like the engine is holding back.also engine light is on but not in limp home mode,if i reset the light it doesent come back on straight away maybe in a day or so.the car does this warm or cold.ive had the throttle body off and cleaned it and it didnt make a diffrence.does anyone live around the york area that i could maybe try there coil pack or anyone got one for sale..........gary😉