You have to get it fault code read.On board computor saves and stores all faulty readings from the engine.Trying to fix any fault without the stored codes is just going to cost u money without any good chance of success.If trusting garages is a problem for u ,then argos sells a suitable code reader.will not fix your car but will cost approx the same as what a garage will charge u to read codes.armed with this imfo,you will be in a better position when u do go into a garage.
caine
August 2008