I own a 2007 Mazda 3 2.3 L. I've been feeling a loss of acceleration and hiccups when driving in lower gears. My car also will hiccup in first gear and sometimes stall out. I have checked the oil and transmission levels and replaced the spark plugs as well. I also replaced my TCM about 6 months ago without reprogramming it. Could that be the issue, because ever since I replaced the TCM I've had hard shift too. If anybody could point me in the right direction that would be awesome. Also my car is a 5 speed automatic

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