Long story short... I put an LS3 in my 2004 gto and it runs good. If I cruise at 1500 rpm it bucks while driving... no bucking below or slightly above 1500rpm, bucks when I cross or maintain 1500.

Nothing wierd on the scanner. Looking thru my tune, fuel prime cut off is 1512rpm, but other than that I don’t see “1500” rpm anywhere in the settings.

Thought on what hat to look for? It feels like cam surge at that rpm, but ultra smooth below it.

Speed density tune, MAF set to fail at 1000Hz

Jake, A/c off... btr stage 2 N/a cam. I tuned out the cam surge and it runs great...except this wierd 1500rpm issue.