Help! Hard Starting And Running Rich?

[GodziRRa]

Hello gurus!

A bit of a problem here. My GT-R has been having some weird problem lately. It would not start if the engine is cold, I have to step on the throttle a bit just to start it. If I don't step on the gas, It would take about 2 or 3 tries before the car would start. And I think it is running rich above the GT-R standards... the plugs were full of black carbon just after about 1000kms of use. And the car is a bit sluggish. I'm not sure but I think the running rich issue is connected to the car not starting when cold.

The car does not have any error codes on it by the way. So I'm clueless as of the moment. Any inputs would greatly be appreciated. Thanks!

[Moodles2]

Mods, ECU, last serviced, factory fuel pump still, did it start acting funny when you last filled up (dodgy fuel), is it hunting while idling etc

[GodziRRa]

Mods, ECU, last serviced, factory fuel pump still, did it start acting funny when you last filled up (dodgy fuel), is it hunting while idling etc

Actually, I haven't done anything as of yet. It is running Mine's ecu, factory fuel pump, gas is 100ron, plugs are BCPR7ES, at idle I could hear a "thud thud" sound at the muffler every 15sec. or so... but it's not so loud though. It's a misfire right? I'm also looking at water and temperature sensor also.