I just got my first Blazer. An '82 k-5, and I love it!! This thing sat for two years, started and drove on very rare occasion. I have a couple questions since I've never owned a 4x4 till now. What are some common problem areas to look for before I start driving on regular basis. Also, the engine backfires and diesels. Put new carb on and helped but still does it. Runs great except at idle its very rough. Hooked up timing light and can't even find mark. Could the distributor be off a gear tooth or two and still run that good?