When I push the clutch down to change gear the revs stay at where they were before I put the clutch down for about a second or two before they drop again and this is with my foot off the accelerator. They stay at 2,000 rpm with the clutch down for a second. If I rev to 2,500 before putting the clutch down, this problem doesn’t happen and the revs drop. It only seems to happen when the engine is at 2,000 rpm and no other rpm. It’s an unusual one. It isn’t much of a problem as it doesn’t really effect me but I’m curious it’s the starting symptom of a problem down the line. I am thinking it could be a dirty butterfly valve in the throttle body which sticks more at this particular rpm, 2,000 rpm or a clutch plate thst isn’t releasing properly but I don’t believe the latter is the case if it doesn’t do it at other rpms.
2006 1.3 Petrol Suzuki Swift.