Difficult ignition in Nissan B13

I have a problem with a Nissan B13 Ga16de engine.
To turn it on, you have to step on the accelerator, in addition once on when trying to accelerate it drown. Some indication of failure. The check Engine witness is not on.

Greetings

Look for what I understand could be dirty the acceleration body opened to clean it manually

Now he ignites the first, without any problem, he stays in progress, but the very unstable slowdown and also the engine sounds as if it were diesel, draw the spark plugs, all hollin covered, which tells me that the mixture is too rich. I think that if it was badly synchronized, simply not part or cost him. Well this engine has a lot of mileage because it was public transport. The MAF or FLUJOMETER shows that the IAC_AAC valve was also intervened, it lacks a spring. Will continue.

Look try to search or give you an IAC valve in good condition and with all components there may be this problem and also sees the butterfly

That engine starts even with a tooth of the chain that is run, I tell you for it already happened with the vehicle of a customer who had the hydraulic tensioners, bad sounded ugly was ugly and did not accelerate well. Verify valvular time.