Car is in limp mode

Car has a misfire. Checked coils and plugs and fuel pump. Code reader said injection changed that problem still there. Been told my chain maybe have slipped. Have not done a compression test yet. Car still starts and drives but no power in limp mode. I am not still driving car atm. But if the chain had slipped would it not damage other stuff? And would car still start etc?

And would a slipped chain cause low compression? In one chamber?