well i have a 90 fc3s gxl n/a and its had some stuff done to it as far as i can see some one blocked off some stuff on my 13b who ever had it last blocked some something and also im not seeing any o2 sensor its running fine when it gets warmed up but when driving its evry time i go to stop at a red light it struggles to idle back up by it self and i have to keep a little bit of foot on the gas on a cold start its also seems to be running rich but what i really want is for someone to answer this qestion is their any ecu upgrades tuneable system thats plug n play that way i can get this bitch to run good plus more power if i can have the abilty to tune it with a laptop ??? list what would be idel for me to have... greedy emange ? aem ? haltech ? let me know i want to also have the abilty to have a revlimter