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Definitely something SIMPLE and fuel related then, excellent. Why would idle make it die, is it because the fuel is interrupted when the vacuum from the motor goes down? I had a similar issue on my M-37, except that had an accelerator pump issue...

Thanks! I will give you a call when we start digging deeper into the problem!

Good thought! Will check with the boss and see if this is do-able $$$ wise...I know that the fuel filters were replaced to try and solve the issue, but it didn't help

Truck is an M813 I think you guys are on to something with the air leak...tomorrow I will check all the fuel line fittings

I will get the answers to these questions today for you guys! I'm unsure of the model, however I know it is a 1977. I will get that information. I am new to this work location, and from what I am told it just developed this issue all of a sudden

Gentlemen, Our 5-ton at work has this issue... Apparently it runs and drives perfectly, but when you leave the truck to idle, it stalls out. I know that this is cryptic....but any ideas on where I should begin looking this week? I searched the forum, but couldn't find anybody with the same...