engine light blinking
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You could do it yourself. But you need to be aware of the 3-valve plug change problems. Read up on the problem involved with changing the plugs (2 piece design) and read the TSBs. You will save yourself a lot of money if you do it yourself - especially if you replace all the COPs. First thing would be scan the truck to see what codes are coming up. Might save you some trouble just to buy all 8 COPs on ebay and replace them all.