MY 99 RAV is smoking at start up with 121000 miles on it and seems to be loosing power as well. i am pretty mechanically inclined but have never tackled a Toyota Engine. Would I be better off to find a low milage engine from a wrecking yard and change the engine out or change the seals ? The shops around here want 1000 bucks to change the seals. . .which kinda scares me in thinking it is a major undertaking to change. . any help would be great!