Good compa, I would say that you begin by the accelerator cable for those that are not oxidized inside and for checking empty leaks, that is, hoses disconnected from and to the multiple admission, I recommend you to find empty leak use clean carburetors in spray, you are gradually applying it on the different points of the multiple also apply it in the O-Rings of the injectors because sometimes they break for being very dry, I hope it serves you, greetings-