I have this problem in all gears... sometimes it happens in first gear when I try to accelerate from a stop, sometimes it happens when I'm cruising around town in third or fourth, I try to accelerate and she bogs.

The timing belt was recently replaced by the dealer but I think I had the problem before that.

Wouldn't a timing problem affect the engine even in neutral or with the clutch pedal fully depressed? Cause if the engine bogs and I press in the clutch, the engine can be revved freely.