Hey guys, well I'm having issues with my 3L 03 patrol, when I drive around doing a lot of stopping/slowing down and taking off (freeway traffic) or if I need to get my power back quickly (slowing down for a give way but not quite stopping) I end up just blowing out a lot of black smoke and losing all power, and the only way to stop it is stopping the vehicle completely and sometimes even switching off the engine.
I read through some advice on here, and replaced my MAF and my air filter and gave my intercooler a good clean (noticed a lot of oil on the outside of it near at the bottom), anyway it worked great for a week and now it's back.

Any ideas?
I'm worried it could be injectors but hoping that it maybe the intercooler (oil on it suggests maybe).

I'm installing a boost gauge once the adapter arrives and I'm getting the NADS done on the 8th ($600 parts and labour good price?).

Cheers guys