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What are signs that a valve adjustment is needed or there is a vacuum leak

pullinin

Member
I have an 2002 F115 with about

I have an 2002 F115 with about 2100 hours. i have been having a problem figuring out why my motor idles ok but when in gear at low rpms is bogging and running rough. At higher rpms>1500 seems to run solid. The last valve adjustment was about 1000 hours ago.
 
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