Ok, so when I first start my car in the mornings, cold or hot weather, I have 2 things happen. First until my car has been running for about 10 minutes I get this lifter tapping sound. I thought I may have to pull the valve cover and set the spaces on my lifters but why would this only happen when the engine is just started? I had to do this with my Toyota pickup 4 banger years ago, not sure if they have the same kind of rocker/lifter setup. Second, when I first start it up I get a not so smooth idle. Most of the time its not too bad, it may die every now and then but most of the time it will have a normal idle then drop about 500 rpms then go back up and so forth until the engine gets warm. Any suggestions?