Turbo studder in boost

Johnoolo

Member
:
2003.5 mazda speed protg
Im posting a new thread because after watching a few youtube vidos i found one and it is exactly like my problem under boost the car starts to studder and lose power. if im at idle and i turn the air on no ac just the fans my vacumn jumps from -22 to betweeen 13-10 with the car acting like its going to die. in first gear under boost i dont have a proble any other gear it studders like the youtube video below ive got new coil packs and new plugs.

http://www.youtube.com/watch?v=S_LWLI1v5ys

could the waste gate just coincidently get stuck at the time i was changing out plugs? i also saw no signs of arching plugs are gapped at .30
 
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