380 sel 1984. This happened all of a sudden. Very rough idle and big loss of power. checked all the vacuum lines seem ok. Is bad fuel an option? checked dizzy cap and rotor seem ok. it was running beautifully then all of a sudden this happened.

 

hard to tell.

take it to the good mechanic first.

 

just changed fuel filter, still nothing

 

i mean do the basic diagnosis like fuel pressure and timing.

 

drained all old fuel, changed plugs, checked leads, added additive and injector cleaner and everything is back to normal. Thanks for your help