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:http://img12.imageshack.us/img12/5596/img0524pa.jpg I am an old Z car enthusiast. I once had a 620rwhp Zcar. Its your sparks plugs. You need to use colder plugs. I Use NGK I really cant remember the part# its been so long. but, its the colder plug than that of factory. that or like TTZ2NV your tuning is off and you need more octane. Either lower your boost. add more fuel, or get colder plugs. I believe they are like 14.00 each. To really make sure of your problem you really need to list all the things you have done to the car.
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