If you really want help you need to provide us with a little more info. Remember you are asking technicians all over the world for help. The Covid-19 has reduced our ESP to about 1% so please paint us a better picture of your problem as we are not standing next to for with drink in hand to see your problem and hate guessing. Things we need to know.
1. Make and model of you unit, including model and serial numbers.
2. Make and model of you engine, including all model, serial and spec numbers.
3. How long it has the problem been going on?
4. What have you done to rectify the problem?
5. To the best of you ability tell us exactly what you are seeing and hearing.