Hey all, my 2002 wrx has recently been having a lot of hesitation. It started above 4K and now is all over the rev range, and it's not consistent. I thought it was a fuel starvation issue so I replaced the fuel filter, nothing. Replaced the fuel pump with a Walbro 255 and it works better but there is still hesistation. I'm stumped. I floor the gas and nothing really happens. There are no mods to the car/no tune other than a catback exhaust. (I also tried seafoam which has done good things in the past) I've gotten 2 CEL recently, P0442 small evaporative systems leak (constantly), and P0171 A/F too lean (after cleaning the MAF and not resetting the ECU which I think was the problem). Haven't checked regulator or spark plugs. Also to note, there is a pretty bad exhaust leak on the up pipe/turbo gasket (found from seafoam) and I know for a fact I'm not hitting 12-13 ish psi (stock I think). So what next? Could there be a blockage in the fuel lines?