Cuore's engine hiccuping on CNG on 4th gear

Hello people:


Almost one week ago I got my hands on the Cuore CX CNG I had previously posted. It was driven 43 kilometers. On the first day of getting the car, I rode what I remember about 20 km or so on CNG. I must say that the car came with an empty fuel tank, but the CNG tank is half full (which I suspect the first 43 km were made on CNG). In the even of the first day, when my car after a short rest after a long drive, I noticed that the engine in the car was hiccuping on the second and third gear. It would feel like the car was throwing to - almost shaking. The next day when I took the car for a short ride, I felt the same hiccups again, completely impaired the driving experience. I thought it might be due to the air conditioning running on CNG, but the air conditioning off, I could feel the same hiccups on the second and third gear. The engine would not hiccups all the time, but most of the time.


I immediately took the car in an authorized service center where she maintained to get rid of the bad pick-up problem. After the service, I did not feel hiccups.


However, I noticed that if I shift into fourth gear, the car would start shaking severely, with the engine coughing. It feels like the CNG supply gets reduced. At first I thought that keeping the foot on the pedal would gradually get rid of the hiccups in fourth gear, but the car would shake and vibrate until I could switch back.


Then I turned off the fuel supply for petrol to narrow down the problem to the carburetor. But to my surprise, the car picked up surprisingly well in all gears all I tried. I took the car well into fourth gear, pushed him hard, delayed, pushed back hard, while staying in fourth gear, but I felt no problems.


However, CNG, the car starts to shake. I'm not sure what the problem really is. I will be back in the car service center. It's a brand new year (with Tracker installed, I may say, but I do not expect Tracker have caused this problem).


Any hints and suggestions are appreciated. It's a brand new car.


Thanks.