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have them or do it urself, replace both 02 sensors. Idle would really be more orientated towards sensors or dirt in the throttle body. The spring on the intake cam would make some noise(more than likely) if it was broken, they don't just come loose. Try to 02 sensors and work from there. Don't let them tear younr engine apart at your expense, and you don't really need a new oil pump as lng as you have been up to date with oil changes, they are self lubricating so in reality they won't go bad for a long time. Well I hope you get it figured out without spending too much
Tom
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