Too much timing will make it hard to turn over, do you know how much the chip advanced the timing? Also, was it supposed to change the air/fuel ratio? I'd call whoever you bought the chip from and see what they say
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1990 Notchback: BBK Ceramic Coated Full length headers, Dr. Gas 3"- 2 1/2" x-pipe, Flowmaster 40's/turndowns.
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