95 Mustang 50 with manual trans engine speeds up fast and slows down a couple times in row and check engine light flashes?
if havent checked already look at the throttle body behind the butterfly valve and see if you have a carbon build up which in turn screws with throttle position sensor giving it a mis-reading
Turn the ignition key on,off,on,off then on and count the the flashes of the check engine symbol .It flashes the first number then there is a short pause then it flashes the second number. Example 24 ( two flashes and a pause then four flashes). Look up this number in Chilton's/Haynes or the shop manual for the vehicle
press the key symbol and the lock symbol simultaneously for a couple secs. The parking lights flash once. Every time you press those two buttons the time increases.The increments are for 1 flash 2 minutes ,2 flashes 4 minutes , 3 flashes 8 miutes and then 4 flashes is 18 minutes. I finally found my manual
On a 1993 you turn the key to the on position to the off position 3 times. On the 3rd time leave it in the on position and count the flashes on the check engine light. Use a haynes manual to check what the number code is eg. 3 flashes pause 5 flashes is 35. Auto zone will help you find what you need.