2.7 going nuts

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Question Asked: replace water pump on a 2.7 car runs really rough
March 23, 2013, 09:06 PM
replace water pump would not start unless we disconnected cam sensor then it would start and plug it back in and the engine would Idol smooth give it throttle and it would start running rough around 25 then go to driving it smooth take off but around 25 starts shaking and running really bad again I'm pulling up two codes P 1684 and P 0340could someone tell me what the problem could be because this problem is driving me nuts
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