:D Hi guy's,a mate of mine has had a problem with his car for a while now that causes it to seriously hold back,its spec is frontmount,walbro,blitz airfilter,3 inch exhaust,AVCR set at 14psi low and 17psi high,SAFC2 mapped by a tuner.I have changed sparkplugs(NGK BKR8IEX set to 0.7mm,new fuel...