Hard starting/engine

I have exactly the same problem. After spending $300 "diagnosing" the situation, a mechanic said only the dealer could fix it. The dealer in Stone Mountain, GA, admitted this model had a history of such problem, promised to find problem, warned me it would probably have to replace the CPM and said to get around $1000 ready. I called every day and got the same answer, "we're getting closer but don't have an answer yet - it looks like the CPM..." They kept it for almost 2 weeks "troubleshooting" the problem, did not change the CPM, charged me $905 ($5 less than if they had changed the CPM), did not show all parts "replaced" and the truck still has the same problem... this happened last week