90 sunbird 2.0 turbo missing

I recently bought a 90 pontiac sunbird 2.0 turbo that is in excellent condition inside and out, runs great until the tachometer for turbo hits the blue area, then it misses til it drops back down below the blue area. The check engine light is on now, but it still runs fine, til that point. any help would be greatly appreciated and if its a part that I need some help on were I can find parts would be great also. Thank you for your time, have a great holiday.

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trish_net13
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