Cylinder misfire in my ford ranger?

Hello everyone! I've had my truck (1998 ford ranger V6 3.0L) run very rough off and on for the past few months. During the time where it did run rough, it seemed to run rough when coming to a stop and a little less rough after accelerating for a few seconds. I specifically remember 3 times where it began running rough after making a slow turn. This running rough, would sound like the engine is running at a low RPM, and almost like something was loose in the engine causing it to run unbalanced, hence obviously making my truck shake with the engine. During these times, the check engine light wouldnt come up. This probably happened about 4-5 times. The last time it happened, the check engine light actually went on, and it came up on my obd2 reader as a cylander 1 misfire. I got my spark plug replaced, my coil pack replaced, and my fuel injectors replaced before the check engine light came on, so its likely not those, unless the mechanic did a bad job. Does anyone know what else can be possibly causing this? My mechanic told me my motor mount had 2 cracks in it, could this have anything to do with it? Thank you for taking the time out of your busy schedules to help out!

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