I bought this plane last May, starting procedure for cold start was to pump throttle twice and crack open the throttle and start. It usually started within a few turns. Now recently the last few times it is not firing up like that. Went out last week I tried to start it 4 times, nothing is working, I was about to give up before I ran the battery down, and I tried one more time and it started running almost instantly. I was going to have an A&P look at this week, anybody know what could be causing this problem. Thanks