mrgregm

Hi all! We have a 04 citroen C3 1.4 SX and there was an incident involving diesel getting into it it was diluted with petrol so it would run and then run dry and has been through a few tanks of petrol since diesel got into but it is having problems the engine turns slowly and chugs and is v.slow and unpowerful, you have to drive in a high gear constantly or it just slows down and you have to keep the revs up when standing still or it stalls, the car does not clutch control well atall, any idea what could have gone wrong? and while i'm here, the car has a loud, irritating whistling noise when on the motorway, any idea about that? thanks in adv. :)