Mine was this am getting out the door. Chug Chug Chug. Finally turned over and ran like a top until stopped at grocery store on the way home.
The other two 150's, both fuel injected, on the way home at different times died when we came to a stop sign. I think we were about the same altitude 6900 feet.
They were a bit iffy about starting and idling but did then went humming along. The buddy experienced none of these problems. We rode 35 miles to the restaurant and parked in shade.
Then headed home in the heat. Top.speed 50. Min speed 25. It's a mystery. The other two had never experienced those problems in the past.