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i posted a similar question a while back like this. when my car is at normal operating tempature, my car will shift into 2nd and 3rd very hard. if a drive like a grandma and accelerate very slow, it wont do it, but once i accelerate a little faste, it will start to jerk. car has 75,000 miles, tranny was flushed 4,000 ago because thats what most people said it might be. 500 miles ago i added seafoam transmission tune, and that did nothing. wth could it be? also forgot to add, the engine makes an odd noise at idle in drive at a stop light, but when put in park, it sounds normal.