hello. i have a msx150 with 50 hrs and i took it out and it wouldnt boost more then half way and only do 21mph. i found the wast gate siezed. i freed it up and now moves very nice open and shut. i took out the map sensors. both top and botton and they are clean with no junk on or in them..i took it back out for a test run did the same thing. check engine came on once and when i shut off and restart check engine whent away and still no power.. how do i reset codes if there is any?please help with this nigtmare what would make it do this...thanks