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The mass air flow sensor, the throttle body and the idle air control motor need a good cleaning. Use a brush and brake clean everything except the Mass air flow sensor, just spray it down, both sides. After you clean it, it will take a few second to restart.
5.000rpm's high revs and you run into problems with valve bounce ( hitting pistons) ,ring slap, gudgeon pin knock, big end noise and possible main bearing noise . You may also be getting a hydraulic lock in the hydraulic followers that is holding the valves open too long. Unless the engine has been specifically built for these rpm's any loose ,worn on unsuitable part will cause problems I am thinking that you have around 100.000 miles on the clock after 7 years and the motor is not young Ford V8 engines specifically built for a 500 klm race are limited to 5.500 rpms because they destroy the timing chain if driven over that speed .
First off, have you changed your trans fluid lately. sounds like you need a trans flush. when you drop the trans pan and replace the filter and fluid you only get 3 to 4 quarts of transfluid. your trans holdt 12 to 15 quarts. so have it flushed completely cost $80 tp $120 but beats buying a new or rebuilt trans. always make sure you have the right amount of trans fluid. underfilling will cause lose of pressure and not shift properly. over filling a trans will cause over pressure and cause worse problems.
could be a dirty filter or fluid might try changing filter and having tranny flushed did this w a 96 windstar only just replaced fluid that drained when changing filter dont forget to clean the magnet area on the pan
Very common on this make and model trans, pump drive splines inside torque converter strip out and pump is not turning, Most times there is no damage to pump shaft. Remove trans and remove torque converter, inspect the splines at the very bottom of the hub hole. If stripped out inspected pump shaft splines which are the smaller center splines coming out of trans, if ok replace torque converter and re-install trans, change out fluid, clean any metal from magnet and replace filter, fill with fluid and verify proper operation.
likely what you are seeing is the first signs of slipping. If permitted to continue, likely it will get worse and you will then lose a bit of speed when it happens. In warmer weather the trans runs a bit hotter and will react to that. If you cannot hear the revs increasing but the tach says they are, it's also possible that for some reason the tach isn't reading correctly. Any good tech should be able to tell the difference. Problem I have is that I'm here and can't drive it to give you a "definite" on either.The only way to verify this yourself would be to attach an external tach to the engine and compare the rpms of the one in your dash to that one.