I'm curious about the cold start part, where it starts, dies, then restarts when you try a second time. My 925A0 does the same thing. Only had her about one month and still getting used to the particulars of the 939 series. I've have Deuces and 809 series trucks in the past, and each one had it personalities about starting and liked certain things to be done to cold start better. So I'm still in the process of learning on the 939 series, even though my past two 809 series used the same engines.
Any ideas? Could also be colder weather starting to do its thing.
For information, she's a 1984 925A0.
When first cold starting, following the tech manual, she'll rev up to around 1500 rpm, then drop down below 500 soon afterward. I tried feathering the pedal when she starts slowing down to keep her running, but most times she'll still die. It could be operator error from not being used to a new truck's personality. It took a while to learn each 809 series engine too.
By the way, love the truck. Been out of the hobby for a few years and it sure is nice to be getting back involved again. Used to be "Lorax" here on-site, but cant remember the password and have since changed e-mail addressed so cant reset the old pasword either.
Bought the truck from a fellow member here but cant remember his user name. Lives in Maryland though. Great guy.