has anyone had this problem

[JWOLVES]

speedy it does not have a miss all the time it will only miss when i let go the gas when I'm driving but it will go back to its regular idle when it is stopped it idles fine i turn it on and it idles normal i put it in drive and it idles normal i start to drive and leave go the gas and it wants to shut down but goes back to its normal idle sometimes it shuts down but it will start up and idle normal do you get what i mean i don't have to keep my foot on the gas to keep it running it runs normal. it has no headers its all factory. yes i have an Ir thermometer what would you like me to check. Mountie i checked the egr it is working fine so are the plugs and wires all parts are delco it was doing this before i replaced the parts and still is. i do have everything to rebuild the motor and was going to do it 3 weeks ago but someone T boned the car my wife drives so i had to let her use my other truck and put this one back on the road