These car that run on nitro methan have to be tuned all the time .You can have it running just fine one day and then take it out the next day and it will fall right down on it's face. So these changes can be caused by weather and al kinds of things. A guy told me one time you will be tuning your car all the time no matter what. So it sounds like you are having a flame out maybe you are to rich try leaning it out just a little bit and see what happens. You will find when you get it running just right, you can tune it right around those settings so it would be a little lean or a little rich not that much but a enough to make it run funny. So give it a try and see what happens and all ways make small adjustments at a time and have the motor at a good running temp.