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This sounds like a bad vacuum leak, the brake system uses vacuum to power the brakes, if theres not enough vacuum to brake booster then the pedal will be hard to push and stop the car, open the hood and start and listen for a hissing sound, follow vacuum leaks and look for broken or aff vacuum lines. hope this helps.
the cluster gears in the gear box have 4 sets on needle bearings as well as end shaft cage roller bearings that are probably worn out you will need to dissasemble the tranny to insepct them
you need to clean or replace your idle air control valve(IAC). The IAC allows your engine to idle smoothly by opening and closing a valve that allows air flow to the engine that is monitored by the computer. The IAC get dirty causing it to stick and move slower than it should which causes the up and down idle
check the accelarator cable isnt stretched (rev the car from the peddle, then from under the hood and listen for any rev differences) although its just been serviced also check that its had a replacement air filter. this could be restricting air.
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