Changed my oil in my 90 sc 5sp yesterday took it to the store (ran normal) then all the sudden very low power so I started messing with it and noticed I can't get boos over 0. Ran codes nothing relative other than default spark error which has been there on and off since 2018 can't figure out why... SC bypass is opening and closing I did notice MAF doesn't seem right if I unplug with car idling no change