Idling issue

hey guys im back for the same issue.... its been about 3 months and my 1996 ranger recently started its idling fits again... wen it comes down from the rpm's the motor wats to almost die and has a couple times and wen im driving it gets stuck in high rpm's.. heres the stuff i have already done: new spark plugs and wires (correct gap) new idle control valve, replace all dry vacuum lines and new egr valve.. i even tryed messing with the idle to see if that did anything and im still getting no where and tired of spending money... any help?
 
I had a similar issue, half the pack was bad and it didnt throw a code once. Also check the catalytic converter
 
I had a 93 that did that til it finally did it constantly. I spent about 1k trouble shooting it myself when it was a bad pack
 
i actually just came from outside and i did a little test.. the motor is capable of running off of only one coil pack so i unplugged each one to see if i hear i difference... i unplugged the back one and the truck ran smooth.. i unplugged the front one and the truck just about died leading me to believe that the back one is bad... wat do you guys think?
 
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