hello people i have just brought my s2 rstubo and had it for a few days now it boosts and holds 15 psi but it has just started to missfire when it comes on boost any help would be great im going to check the fueling and ignition timeing tomorrow. what co2 level should i run as a std one run 0.5 -1.5 % and std timeing marks are 12 degrees btdc with out the vacum on the ecu. should these be diffrent now its running more boost ect ect. it has been chipped and had fuel metering head mod and has got -31 & stg2 turbo. cheers guys