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Originally Posted by dinan e39
Just when I thought I had escaped a faulty tranny, problems are now rearing their ugly heads. The car is a 2005, 4.4, 57K miles with updated tranny software. The symptom is as follows: Driving on flat roads around 30-35 mph at roughly 1000-1200 rpm, the transmission jerks as if it is attempting to shift. The jerk is very quick almost like the motor is missing. As soon as you apply a little throttle it goes away. I haven't completely ruled out the motor but it feels as if it is generated from the middle of the car. Any others have this happen? Any diagnosis? TIA.
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My issue was at speeds 35-40 would get a harmonic noise of rotating grinding type noise on flat road, but on slight uphill grade would begin to jerk until I applied more gas. Also felt like the motor was missing, but I had changed the plugs and the week before this started I had replaced all the ignition coils. Also felt like it was generated in the middle of the car.