can anyone advise my type r has just had its first tank of shell optimax it is now not running as well as just on super unleaded ecu apperas to have reset but when i declutch engine nearly cuts out then adjusts to normal tickover.I am a little worried.Help????

 

Jabroni i also have a type R and use optimax normally takes a couple of tanks for the ecu to adjust to the fuel . But sounds like you might need to do an ecu reset . G.