right my s2 is doin me head in, doesnt want to start and when it does its running like a bag of shite, sounds like its only firing on 2/3 cylinders,backfiring,the fuel pump works fine but is not getting a constant feed (volts) its sparking its got a new dizzy rotar arm and cap plugs and leads fuel filter ive swapped over the management still nothin, what happens when the fuel metering head gives up? and where does the pump get its signal from, theres 4 relays behind the dash blue green purple and i cant remember the colour of the other one what are they for