Im glad I found this post what Noah says a few posts back is good advice, break up that carbon and put a new coil in to prevent it from building up again. I have an 89 ram that I have struggled with and been unable to get smog legal even with some help from my local ref.
I thought it was Carb related but after reading this I want to try a new coil, do a compression test and clean out the cylinder walls then see if that passes.