car revs itself upon ignition and backfires constantly. Had checks at garage but they say the only thing they can think of is it might be a valve under cylinder head, which will cost £300 - £ 400 to do. Had exhaust welded on saturday, rear end and middle. Drove 300 miles okay but problem surfaced on Sunday. What could this be ?
Nov 20, 2012 at 2:49 PM
