What causes a ERST running EFi to pop and sometimes even back fire when pulling away from a standstill ?

it seems to only do it when warmed up, or sitting a traffic lights etc... not when cold...

as i lift the clutch and go to pull away normally, it hesitates and judders, and you can hear the exhaust pop occasionally or if really bad it backfires ?

is this due to leads arc-ing with each other, or a worn rotor arm and dizzy cap ?

its fu*king annoying, everytime i am in town, it kangaroos from a standstill