I have GC 5890 with FID and TCD. When I run my FID, I have consistent ghost peaks. This happens when I press start during these conditions :

1. When I didn't even ignite the flame
2. When I ignite the flame.
3. No carrier gas or air/hydrogen flowing through the column
4. when carrier gas or air/hydrogen is flowing through the column
5. with or without sample injection

However, the signal is stable when I don't run anything or didn't press start.

The TCD is on the same machines and works fine.
I have tried a lot of things to sort this out but not working, I have cleaned the column, the jet.

Please see attached the ghost peaks.