my dodge pick up shakes when accelerated?

Silver

New member
this is the fact, before I would have bad gas millage and my check engine light was on always so I put in new engine coil and then new coil wire and vehicle start to get good gas millage and was running great but about a week later I put new spark plugs in and my vehicle seemed to be at a great boost and seemed to be going faster but as a result my engine seemed to be shaking and now the inside of my truck shakes. And also now my check engine light blinks every once in a while but often. I have a 1500 dodge Ram pick up 1999yr.
 
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