My 2000 ram 3500 has an engine surge between 40 to 45 mph. It only happens when I'm stuck at that mph. If I can get through to high gear without getting held up @ the 40 to 45 mph area It seems normal. Any help would be greatly appreciated.

 

is it falling back and forth from 4th to 3rd gear?

 

doesn't seem to be. I had this situation happen several years ago with this truck and mech. determined it was the alternator. can't believe it could be happening again.[IMG]file:///C:/Users/RENTAL%7E1/AppData/Local/Temp/moz-screenshot-1.png[/IMG]

 

it could be the alt causing the O/D to kick in and out.if it doesn't feel like its shifting then its probably your APPS failing

 

let me know if its your apps,there is a way to fix it so you never have that problem again.at no cost

 

sounds like bad grounds clean all connections including the gound on the engine block underneath before you spend money.

Mike

 

Maybe that is what is going on with my '01.
I seems to surge 125RPM or so if I hold steady low throttle.
It does it quickly like a three or four surges in less than a second.
If I drive it at more than 1/4 throttle it seems super smooth and with lots of power.
I got no codes when I used a scanner.
I will check the grounds, as it would be a sweet cheap fix!

 

thanks to all who responded. ultimately it was a loose ground on the battery side of things. guess I'm just getting old! Need to get up on the wheel next time i tighten things. Thanks again!