My 2008 e-tec 150HO model # E150DHLSCR has had a problem not wanting to start first time of day, takes up to 4 or 5 turns of the key before it starts, no problem rest of day. Returned it to dealer three times, just kept putting new maps in computer, there mechanic had Evinrude rep come in he could'nt figure it out either. They decided to replace powerhead with a new 2010 model, still have same problem. Any idea's on whats causing this?