problems with my 92 johnson 150 f/s

[Yfz45011]

The last couple of trips its been a pain to start when we first put in. But once it starts its usually just fine the rest of the day except for Mon when we went out for couple hours. Was going to load up on trailer, while waiting for the g/f to back the truck down I shut the motor off, started back up started towards the trailer then she died and wouldn't stay running if it did start back up so ended up loading with trolling motor and winching up. I put new plugs in sat but was in a hurry to leave for our tx so I didn't gap them. I have also tried using marvel mystery oil poured into gas tank according to label directions. This never happened til I had used the marvel mystery oil about twice but may just be a coincidence. Runs same as always once it starts. I'm not sure what compression is as I've not checked it yet. I always put ethanol free gas in it. Could it of just got a little moisture in the gas from the couple cool nights we've had the last week or two? Thanks for any and all help and sorry its so long.

 

[derek81]

I had something similar going on with mine but it has to do with ethanol gas.

 

[Yfz45011]

I'm at a loss. I have no idea. Had a timing issue while back that made it difficult to idle. Idk if its that again or something else. Only other things I can think of is maybe low fuel pressure or bad/low spark. I've rebuilt a while back also so dont think it would be anything with them. Or maybe fuel lines need replaced. Bubble gets tight wen pumped though unless it looses its pressure.