hi, i have a 97 expedition 4x4 EB, I have begun replacing all the spark plugs after i let it sit for about 6 months and now it misses terribly.i hae successfully done 6 of them, 1-6, the only ones i cant get to are #7 and #8, the two to the rear of the engine on the driver side, theres some type of fuel line input or something in the way and i cant get the coils or plugs out, if anyone can help that would be great, as to how i disconnect everything, thank you