I am a university student on break, and am trying to compile a list of maintenance things to do so it is ready for when I will be heavily commuting again, so anything I notice that seems a bit off I want to nip in the bud right now. On cold starts only, the engine begins to start, then almost just pauses for .5 seconds, and then turns on. The engine used to cleanly start on cold starts, and progressively started this pausing process. It runs great, and starts clean the other times. I am wondering what could cause this, and if it is something I can fix or just how the engine is? Thanks.