Car model: e70

Engine type:4kc

Problem : VERY rough rev up to about 3000rpm pops and back fires,
VERY very hard to start usualy drains battery and need a jump.

up untill this point i had random key banger like pops/backfires with massive black clouds of smoke left behind me while driving but engin will keep running,also rough random surges of power like im feathering the throttle, hard to explain.

now car wont start and when it does its rough as shit, took it for a spin just now and its dog shit no power and its like poping around almost stalling.

i changed leads, cap, fuel filter, cleaned carby and also service.. all started to happen recent and cars been out of action for a week,