Why is Jag xj6 running poorly?
I drove the Jaguar a few miles, parked for an hour. Weather was in the 90's, the car temp was normal. When I started the car it would not rev much over 1500 rpm and ran poorly. Code 48 showed idle speed controller. I checked and the controller was working fine. Unable to drive the car was hauled home. It starts and runs normal until it starts warming up then symptoms return. Would appreciate your advice. Thanks, Richard