It depends if you can do it yourself or not. I dont know if the injector is your problem, but i can find used injectors for about $125 each here in Houston. No guaranty on if they are good or not. Removing the valve cover is a pain, but if you can do it yourself, you will save a bunch of $$. It will take a few hours if you are unfamiliar with the process. If you take it to a shop, a good rule of thumb is "if it goes into the shop, expect to pay around $1000".
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