Runs smoothly below 1.5 rpm. After, it roughen when not driving and jerks if on motion. At rpm above 2 it moves as if there is no problem
Your torq converter is failing, I would take it to a transmission shop to confirm
SOURCE: 76 volvo 240 car idles and low speed is rough,
It could be the filter. Has the fuel been changed after storage? I would also thing the Carburetor or the fuel injectors might need to be cleaned.
SOURCE: 2002 Honda Accord SE 4000 RPM jerking
it might have a bad coil pack. does it miss at all? the plastic boots deteriate and cause an arcing in the spark plug tube. my experiences have always been high rpm is ignition be it a coil pack or something in ignition.
SOURCE: my car is jerking while accelerating and reaching certain RPM
I would look for a fault in the ignition system such as a cracked spark plug. Might need a scope check to put your finger on the problem
SOURCE: my car is jerking while accelerating and reaching certain RPM
clean mass air flow sensor check for mil light
SOURCE: Engine Mechanical problem 2004 Kia Sedona 6 cyl
Nothing to do with valve control but o2 sensor should be replaced and also sounds like the engine is misfiring when gas is applied, this may be caused by a bad coil or sparkplug.when was your last tune up?, i would replace sensor and also make sure there are no other codes , even check for history codes.
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