yeah they have to buy the parts... or if they have h23 ecu for auto, and maybe some sensors and stuff laying around then they are good to go.... The car i have replaced the map, tps *actually whole throttle body*, distributor, coil, alternator, and then last night i cleared teh computer and got it to come back on and i got a knock sensor code out of it. looked under neath and it was seperated so i slid it back in and it still doin the same thing. when u push the gas it doesnt wanna go. and if it is going it just starts hesitating. at an idle the car runs perfect besides the valve lash tick. lmk people call me up i dont get on here much.