hi, i am just wandering what the symptoms are for dodgy wiring looms? the car is misfiring, it has just coverd 150,000. if i have the car in neutral and hold the revs at say 2,000, it jumps up and down in 2 second stages although my foot does not move on the pedal . any help would be greatfully appriciated. past experiences and costs of new wiring loom, injectors or whatever you think it could be.many thanks in advance. gareth