I am currently having problems with my mustang running Lean after doing all my below listed upgrades, I have a 190lb fuel pump & the fuel regulator all the way down but it's still running lean, so far everything I have done to troubleshoot includes, Making sure I had nothing infront of the sample tube & using a Conical 9in k&n air filter, New O2 sensors, adjust & correctly configure TPS sensor to correct voltage, check voltage on Meter & try to adjust but voltage is to jumpy, Reset Computer & verify fuel pressure in rail