I have a strange fault here on a 2008 308 1.6 hdi 9HX that when driving and changing gear the engine rpm increases for a short moment and it seems the more you increase acceleration the more of a rpm surge it gives on gear change, if I pull it out of gear without clutching it doesn't happen, so far the pedal has been replaced, butterfly for throttle, clutch switch, egr cleaned, intercooler checked for oil but still no change, there is only 1 fault in management for glow plugs relay, here's hoping someone has experienced this problem before and can advise, thanks.

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