My XF is running like a dog. Every once in a while, (ie twice or three times a day.), the engine will misfire. Before you guys tell me to change the ignition leads, plugs etc, I changed them on the weekend: the leads are Bosch Sports, the plugs are Champion Gold, new from Burson Auto Parts. And it still misfires. Just last night I was playing with the ignition timing. It was originally at 12 deg BTDC. I advanced it to 14 and drove it around, still did it, retarded it to 10, which is the factory setting and it still did it, took it to 8 and IT STILL DID IT!!!!!!!!!!!!!!!.
HELP ME PLEASE. I AM AT WITS END!!!
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