1997 Mitsubishi Eclipse Q&A

1997 Mitsubishi Eclipse Question: RPMS EXTREMELY HIGH DURING IDLE

I tripped a bunch of codes on the OBD P0301-P0304 ALL CYLINDERS MISFIRED AND THE IAC TRIPPED AS WELL. On my way to work earlier i noticed that when in neutral the car began reving extremely high on its own and i had to shift into 4th to bring it down then when in neutral moments later it did it again. when i got out of work the car would not start and when it did would not hold idle i had to give it constant gas. i have already replaced the IAC and it idles now but it also SKYROCKETS to 4k-5k while idling and i have to turn the engine off -
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