hi all ! is the firing order on a rover v8 the same on all years and are p6"s and sd1 "s the same order ? the rover v8 in my 100e ran o.k ! but then wasnt started for a few months and now runs crap as in lumpy and cuts out so i thought the leads were duff ! so i fitted new ones one by one as i took the old ones off but its still the same the plugs are o.k so could it be something electrical ???