Quick and easy answer is let it warm up for about 2 to 3 minutes before you take off. Mine does it and so does my wife's durango. You could have it checked but I'm pretty sure you will get the same answer. It will get even worse in the winter
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Sounds like pinging to me. During the summer it is worse for me so I use 89 octane minimum. During the other seasons we can go down to 87 octane with no problems. If it is pinging increase the octane or take it easy.
My truck does the same thing with the 318 V8, especially the hotter it runs in off-road situations, etc... I think it's perfectly normal, mine has pinged every once in a while since new. I switched to 93 octane and now it does it slightly more but then again I have 142K miles. All in all, I've talked to many people about the problem and it doesn't effect engine life or cause any harm, so you should be fine.
JAURS thats good to know, i was worry about it. i will continue to use 91 octane. (i thinks that our higher octane here in colorado) also i notice that when i turn the lights on the interior dash light will dimm and after while they will get bright again... does anyone has any idea whats going on??