Stumble at 38-45 mph

[jelag]

Our 08 5500 with the Aisin transmission has a stumble at 38-45 mph... light throttle while in town or on the highway... . its had this stumble since day one... . and now 16K miles later and after some sensor changes the problem is still there and the dealer has no idea... But if you press the tow/haul button it goes away... . we don't know if this is a program problem with the transmission or an ECM issue..... and if you have medium to heavy throttle pressure... . you can drive right through the problem...



We aren't really looking for answers but more to make you aware of the problem...

 

[Xgunfighter]

I have exactly the same problem with mine on a 850 mile trip. The truck is new. It feels to me like an EGR problem on a gasser. Will be interested to see others responde to your post.