99 dies when you let off the throttle?

jw7054 · January 29, 2017

I have a Chevy 99 z71 4x4 LT. It has had an egr code that comes on and off since I bought it like 6 years ago. I have cleaned it and it turns the code off but it ends up coming back, I haven't checked the codes since it stalling out. The problem is when you let off the throttle it starts to lurch and when you are braking going up to a stop it dies. You put it in neutral and it starts after no more then 3-4 seconds at most. It has 183k. The problem isnt Everytime. Sometimes it stalls, sometimes it almost dies but doesn't go below 500rpm. Sometimes there is no problems coming up to a stop. It doesn't start hard, starts right up, cold or warm. It doesn't pop or smoke. There aren't any mods done to the truck. So what do you think it could be? I was told maybe a vacuum leak and I have thought about changing plugs and coils but haven't yet. Any ideas or help is appreciated. Thanks!

Sent from my XT1585 using Tapatalk

rjgti · January 29, 2017

so you have mech skills

muddkatt · January 29, 2017

Check codes and report back.

sefiroxx · January 29, 2017

Check/clean MAF sensor. Spray brake cleaner around air plenum and hoses to see if engine speed changes. EGR might be clean, but the pintle coil/motor might be irratic and subject to impact of heat and vibration and may need replacing.

How is the mpg, excess air (introduced after the MAF would cause a lean condition.

Sent from my XT1053 using Tapatalk