A cars tach jumps and runs with engine rpm.Sometimes if it jumps and changes engine sound,the throttle position sensor needs changing.If it jumps with no engine speed or sound change it means your alternator is going bad.
Check the speed sensor
run a new line to the distributor.
kangaroos
Your head jumps up and down.
it jumps up and down
Automatic declutch bobbin winder – which means the machine automatically stops the needle from going up and down when you are winding thread onto the bobbin. ... Needle up/down button – this button allows you to start and stop with the needle in the down position if it is highlighted.
The needle clamp is collar and screw device that holds the needle to the needle bar. The needle bar is the part that goes up and down as the machine sews and is in front of the pressed foot bar.
Check your antifreeze level.
jumping...i don't know what you mean...posting...no tht going up and down up umm.. when you frighten the horse he jumps(SPOOK) or YOUR CALLED AN EQUESTRIAN WHEN YOU JUMP HORSES.
controls the up-and-down movement of the needle and thread take-up lever
"treadles" refer to the foot plate under the old-timey machine. You rock the plate up and down, to move the needle up and down....
It goes up and down, carrying the thread down to the bobbin area, where it gets locked into a stitch.