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I have a 2005 300c that has developed a surge when it is at a constant speed. I had a code “P3497” pop up, I changed the oil and it went out. About a month ago I had the transmission flushed at the local dealer so the fluids are fresh. I do pull a trailer with this car but the load is under a 1,000 pounds. I am perplexed with this issue, if anyone has any ideas please let me know. Thank you.
 

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Just a shot in the dark here, but are you running a tuner? If so, it may be the MDS. I know when I installed the predator tune on mine it made my car surge all the time during MDS engage/disengage to the point that I had to have Diablo give me a "fix" file to correct the issue.
 

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just a shot in the dark here, but are you running a tuner? If so, it may be the mds. I know when i installed the predator tune on mine it made my car surge all the time during mds engage/disengage to the point that i had to have diablo give me a "fix" file to correct the issue.
x2! x2!
 
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