Wotcha.I've just got a 20 year old XJ600.Took her out the other morning,got onto the motorway and opened her up and she ran fine.A few miles went by and started losing power.Pulled up and she stopped,after a few attempts she fired back up and ran fine.This continued until I got off the M1,pulled up and let her cool,then she ran fine as if nothing happened.I'm suspecting fuel,help!!!!
Hagar