Dodge Dakota; Spark Plugs?

You had a problem with the poor running and the dealer told you what the problem was so they replaced the parts and fixed it, Bullshi t They love to screw people. i would take it back to them and ask whats the problem and if they tell you its something else then tell them to put back all the parts they removed that they said were faulty and charged you for and fix the problem.If they are as good as they should with the diagnostics they be able to tell you for sure. Should take it to a reputable garage and get a 2nd opinion