Ive had a series 2 for couple years and haven't really paid attention toit so got disco 3.5l v8i to play with but i got it cheap with gas conv, it is running like an old 4 cylinder with a pot off. before i replace all leads n plugs n dis cap. any suggestions please. I'm not to sh** hot on these engines. any help would be appreciated.

 

I am confused, which one runs bad, how many miles on it?