Are you sure the chip is working? The factory rev limiter is set to 5500 on your car. The springs that come with the TW's should be good enough for that cam, however they could still be worn out and weak.
I'd double check your chip first, then maybe replace the springs. AFM has some good springs that are a direct replacement on your TW's.
Andy
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88 coupe
91 LX NMRA Pure Street 5120
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