Hi, I'm new to this site but found it cos I need help with my Mk1 Octavia Vrs. The car has run sweetly for 6 years but has started miss firing on long journeys. Fault normally occurs after about 100 miles when engine starts missing on one, two or three cylinders. If the engine is shut down for say half an hour fault still persists but if it is shut down for some hours the fault disapears. If I put my foot down when fault is in progress it makes things worse but if I apply a very slow increase in acceleration the fault level appears to reduce ( ie. it feels like its firing on three rather than two ) Can anybody suggest whats causing this? ( injectors, coil pack, EMS???? )