Only three cylinders running

Only three cylinders running changed spark plugs and ht leads found it was no. one not working still runs just what could be causing it?

I have changed spark anb ht.
It is number 1 front cylinder.
Still fires but only just.
Burns ALOT of oil and smells really strong?
Would really like any ideas befor i have to resort to taking the block apart as not the best under the hood but do not have the funds to have loads of work done.
Please help i love my little car