Mitsubishi Triton 6G72 Ignition problem?

Hi,

Upon starting my vehicle lately, I've noticed a change in the noise the engine makes during ignition. (6G72 3L V6)

It seems slow to start up, as if the engine isn't getting enough current from the battery.

However, I've checked the battery leads and cleaned the termials, with no change.

I've recorded the noise the engine makes during ignition -

It can be heard here: http://www.zshare.net/audio/7275587346ae84c1/


Am I just imagining things? Or does anyone know what may be causing this?

The spark plugs and timing belt have just been replaced 5000km ago, and the engine was working fine up til now.