When I turn the key on, the check engine light blinks along with a single beep followed by a pause then three beeps, and repeats. Also I notice the tach needle jumps when i turn the key on. The engine will idle smoothly, but won't rev up. <br />Igave the engine it's 2nd 100 hour oil change about 10 hours back. The old oil looked clean, and the owners manual didn't call for a filter change, so I didn't change it. Once last week it skipped a couple beats on first acceleration, but ran fine the rest of the week. My owners manual blew out of the boat last week, so I don't know how to interpret the beeps. <br />Engine is DF 70 4 stroke 2003. 210 hours on plugs.