Hey I'm about to sell my GSR thats in auto trader and its acting up i havent fired it up in about a week and its hard to start the first time or when u dont start it for a day. And when it is started and warmed up i cant rev it without having it back fire and sound like a subaru all the way to the higher rpm's about 6-8. When its idleing ill WOT it and it will either stall or rpm's well not raise and backfire. but when i ease the gas it goes up fine. and ill sit there and rev the shit out of it trying to make it go away thinking its injectors. any ideaS?! it's gonna be sold and i dunno wtf is wrong with it