hi guy's anyone help with a little miss fireing problem? i have a 3.5 efi which runs rough at around 2800 - 3000rpm , but only when the headlamps are on.I have replaced the battery and checked the alternator which is producing around 13.8v. it runs perfect when lights are not on. any ideas...

can anyone tell me which size swivel seals my disco has? it's a '92 (k) v8i