Aidan Birley
Have a look at this threadv70
Worth a thought, Not exactly same as yours, (i.e yours seems specific to cylinder 3) but did give strange symptoms for the fix.
Cheers aidan
Message Thread 
Volvo V70 B5234T3 2001 - Misfire, code 3503 misfire cylinder 3 - Unresolved # - Glen Strachan September 1, 2011, 4:47 pm
« Back to index | View thread »
on September 1, 2011, 7:27 pm, in reply to "