My truck just recently started doing this.

It’s a 2016 fully deleted 5” straight pipe and warp tuned by DRD.

When I start the truck on cold mornings and turn the exhaust brake on it will spool up like normal but then start to surge.

There’s no surging when actually using the exhaust brake to slow down. Also does it at high idle.

It didn’t do it when I first deleted and tuned it.

Performance wise the truck seems fine, just hate the way it sounds when I’m trying to warm the truck up.

Any help would be greatly appreciated!