Toyota Tazz Engine Hard to Start

I Have A Toyota Tazz 160i 2004 Model,it Keeps On Miss Firing Aswell As Backfiring. I Replaced The Plugs,the Petrol Filter And A New Oil...

My Vehicle Listed Above Has A Hard Start, When It Turns On Eventually, It Heats Up Fast Past Half Gauge, Runs Quite Fine But Once Hot And...