i have a 1994 OMC 115 Turbo Jet (inboard) can someone tell me where the power pack is located on the engine - the engine starts fine when cold and runs well at all rpms for about 20-30 minutes, then it shuts off as if the key were turned off - this happened a couple of times under 3/4 throttle....sometimes it will start right up and run for a couple of minutes (but would bog-down like no fuel) then shut off again and will not start.....sometimes she'll just crank over with no hint of a spark....the next morning(s) it fired right up and ran fine again for 30 minutes....is my assumption correct that the power pack is failing? - thank you for any assistance