my z has just started to miss slightly especially from cold, seems to pull ok but you can fel a misss on her.

the idle seems low too do you think its an air leak

could be a coil andy duff is probably the best person to ask or 1 of the other tech guys.

Idle may be low due to a cylinder not firing, which would explain the misfire, take off the coil pack and injector connectors and give them a good clean they are probably caked in the dreaded green shite that causes so many electrical problems, also clean the ecu temp sender and ptu connectors they are a common fault for a missfire.

thanks will do and ill let you know