I have a 1994 mustang gt 5.0L 302, my car will cut out while driving in all gears at all rpms and when i push the clutch in it will rev itself to over 2k rpms and wont drop till i tap the throttle then when it drops it will only drop to 1500 then will drop to normal when i am stopped idling for 15-20 seconds.and it idles normal when first started but then will idle down and soung kind of like it has an aftermarket cam but then will idle down and almost die then pick itself back up.
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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 .
you know some mustangs have an adjustment system on the clutch pedal, and might need adjustment, or if you install a rebuilt clutch instead of a new one some times they come unbalance and vibrate if you did just never again trust a rebuilt clutch kit