Well, with respect to the fault you describe, I think what you owe of check is the oxygen sensor that is working well, since this causes this type of failure (rich dema mixture, mixing too poor) when the mixture is too rich, the oil and the degrades are very fast, and it causes the vehicle to work drown Check it, if you don't know I can tell you how you do it. Also check the delivery of the injectors or injector that are not being open, it is advisable to send them to a laboratory to check them well with the appropriate equipment, or if you have the equipment performs a injector balancing test and the result will give you the diagnosis, in the same way the temperature sensor is lowered.