I have a 5.3 that I swapped into my obs
I put an ls6 intake on the engine and swapped the cam.
I did have the ecm tuned for the cam. (mail order)

The truck runs and drives fine but once the truck has warmed up to temp, It will stall and die on deceleration. It will restart fine but when I come to a stop again, it will begin to stall and die.

I have this same issue if I rev the engine in park and try to let it to return to idle. I have to pat the gas pedal gently to get it to return to an idle.

I dont have any codes, I checked fuel pressure (58 psi)

I really need help diagnosing this problem. Any suggestions please.

 

It's in the tune. Any tuner should be able to easily fix it.

 

X2.

A mail order tune will get you in the ballpark. It will either need to be tuned in person or you will need to send logs to the tuner to get it dialed in.

 

X3, a mail order tune could never get it right the first time with that intake swap that you did aswell.

 

Ok thanks
I figured it was in the tune but needed confirmation
im going to get it dyno tuned soon

 

They might not find that in a dyno tune, ask your tuner to look at the DFCO (deceleration fuel cut off) and throttle follower (and related) tables