Hi FloresGarcia, look, I think you start starting at the beginning, when did you perform the last tuning?, That is: change of spark plugs, air filters, oil and gasoline and motor oil, I also recommend giving cleaning to the distributor's lid on the inside, in the posts and in the brush since a kind of tartar accumulates and it is better to remove it for better contact and spark jump. I had a tsuru that after the tuning the engine followed it was composed only when I cleaned the distributor cover. What I tell you recommend that you be unveiled every 5,000 km unless your owner's manual says something else. Well when you have made the tuning to see how you go and tell us. LUCK.