Stuttering Problems with car

I have a 2000 N16 1.8sport+. I am having a real problem with the car stuttering when I change gear(any gear) when I let the clutch up and press on the gas it stutters for a few seconds then it drives like normal. I've changed the spark plugs and I've tryed the coil packs out of another almera both making no difference. I took it to a garage and had a diagnostic done and this said random misfire(nothing conclusive). The engine doesn't seem to misfire with the engine on and not driving. Only happens when I'm driving at each gear change. Sound familiar to anyone?
 
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