My 01 Zx6R is running very very rough it wont cruise for nothing feels like im riding a wild bull with the constant acceleration/deceleration. in 2nd gear i can get the bike to redline but click into third it will hold the rpm wont go any faster and if i let go the throttle itll start to choke and die in the lower rpms. i dont know what to do. ive replaced the spark plugs and even cleaned the carbs but the problem persists. sounds horrible like maybe its misfiring and theres no acceleration it has to fight through the misfires to gain speed sort to speak.

The cruise control system in Carmy has cruise constant speed, cruise acceleration, cruise deceleration and other functions.
Source: https://www.wapcar.my/cars/toyota/camry

Personally, the first place I would be checking is your air filter.

batt could be slightly weak-maybe at 12.4volts--test it for 12.6 the standard------chec connections---------also carbs cud need pro cleanin and ajust

Your torque converter lock-up solenoid is sticking in the "Locked-up" position.

When you accelerate past 1st gear (into 2nd), your transmission "locks-up" to the engine

run the fault codes to determine the area of the fault

Its probably a problem with the cruise vacuum hose.......maybe blocked a little or the vacuum seal leaking a little. Trace the vacuum hose through to the engine area.

Generally... There is ON/OFF - SET - ACCELERATE/RESUME, COAST/DECELERATE. Cruise is available at speeds above 35mph or so. Sometimes there is no main on/off. Cruise on a turn signal stem has a button that pushes in on the end, push when at desired speed. resume/accelerate slides to right, is spring loaded and return left when released. the same lever when slid left is coast/decelerate. Momentarily sliding accelerate and releasing increases crusing speed by a couple mph. If brakes are used cruise disengages, sliding resume returns you to cruise speed after braking. Coast/decelerate disengages cruise, when at desired lower speed hit set. On some, hitting set not needed, when coast is released speed is maintained. Variations may be up/ down instead or may be steering wheel face mounted. Please rate answer. Duct tape is like the force, it has a dark side.. a light side.. and holds the universe together!

Have the timing checked. Check the ignition coils also

Sounds like you could have gotten some water in your fuel tank from that fill up. Go to a autoparts store and get a product to put in the tank that takes care of water in fuel. Use it when you fill the tank up a few times after and hopefully it goes away. Whenever you can't sustain power in the engine or it runs rough then your cruise control will constantly be shut off because the engine doesn't have the power to keep the speed up and should go away once your engine is running clean again.

Good Luck

Check for exhaust leaks. Esp Leaks toward the front of the car. Hold your hand over the tail pipe using a rag and see where the loud hissing noise comes from. Repair the leaks and I bet the backfiring goes away

Good Luck