my g/f got a 99 sonata bout a year ago, for 2200 bucks, so far we have replaced the MAF, both coil packs, the TPS. the input sensor twice cuase her mechanic is an idiot.. i think, wheel bearing( part of dmage cuased by pass side frame dropping out on me) this thing has been a nightmare for me. both cv axles too. will be replacing rotors soon as well. at any rate been having someissues with the shifting sometimes it wil shift fine, but on hilly terrain it likes to not shift into OD and will hold the gear at like 3 k im guessing th output sensor or vss is messed up , anyone care to chime in?