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Could be the CP4 pump. They have a bad history. If it did fail, in many cases the injectors, injector lines, pump, etc are all contaminated with metal shavings. If this is the case, that 8k price is in the ball park of repairing it. Local GM houses has done several and they range up to 10k depending on damage.

The CP3 conversion is a good solution but won't do anything to fix the injectors if they are contaminated too.

If I can ever be of assistance, don't hesitate to ask.

Take care,
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