Wont switch gears tell at 5500 rpms - 2001 Chevrolet Malibu

Check out tps sensor it has a big effect on shifting of vehicle. The data provided by TPS is invaluable for proper startup, idle and easy throttle response of the car. These operations are affected when a bad throttle position sensor feeds erroneous data to the car's computer because of which the:

• Engine malfunction indicator light (MIL) is turned on
• The driver of a car experiences difficulty while changing gears.
• The fuel economy of the car drops drastically.
• Causes difficulty in setting base-ignition-timing of the car a bad tps causes transmission shift issues, bucking, jerking, idle surging, engine cut off, hesitation on take off, surge while cruising down highway. it may not be that but try another one and find out. you can test the tps, just unplug connector to it. use a ohms meter and hook one lead to the top and other to the center prongs on tps itself. next move throttle very slow, if good tps will move needle on ohms tester it will sweep up without cutting out. but if you perform this test and the needle hesitates at any time you move throttle plate it is bad. 1 is ground, 2 is signal, the prongs on tps. good-luck