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Discussion Starter · #1 · (Edited)
I have a 98 ram 5.9 2wd,truck just hit 122,000 and the idle seems eratic in park or drive in park it goes from 600rpm-650rpm like its surging? any ideas? I pulled the codes and there are none! also sometimes my temp gauge will go to 210 then back down to normal and I have noticed it does it everyday. also truck does not lack any power.
 

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Might try a TB cleaning, throttle plates and the IAC port. Might just be some carbon in there?
 

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sully75 said:
I have a 98 ram 5.9 2wd,truck just hit 122,000 and the idle seems eratic in park or drive in park it goes from 600rpm-650rpm like its surging? any ideas? I pulled the codes and there are none! also sometimes my temp gauge will go to 210 then back down to normal and I have noticed it does it everyday. also truck does not lack any power.
I'll bet it's the IAC piston that's carboned up. I have to clean mine like every other year. As soon as I get the "idle lope" I know it's time for a cleaning. I use Easy Off oven cleaner, and it cleans the carbon right off sweet! Problem solved
 
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