This issue has been showing itself since early fall when temps were only in the 40's & 50's Farenheit overnight. What happens is this: I start the truck (early 04 5.9, stickshift QCLB) and it will bring itself up to idle. Then there's a slight stumble that you can hear chug like once. The RPM drops below 500 for a second and then it recovers itself back up to about 750 or 800 rpm. A minute or so later, there's a larger & more noticeable skip and it'll almost choke itself out and then it'll recover back up to 900rpm and there's a huge puff of black out the exhaust.If it stumbles bad enough, it won't recover & then stalls. It'll start right back up no problem, but it goes right back into that same cycle. If you try to drive away (because once the truck is warmed up, this problem goes away), it'll act like it's not getting any fuel at all and stumbles & chugs. Then all of a sudden it gets enough fuel & there's a huge black cloud and a puff of white in the middle of it... after it takes off accelerating etc. Now that the overnight low temps are in the 20's this has become a real problem where I can't even leave the end of the driveway for fear of it stalling in front of a school bus etc. When I come up to a stop sign, it tries to die, etc. Like I mentioned, however, once you get on the highway & get it fully warmed up, the problem goes away & it idles just fine.I am trying to correlate this to the grid heater cycling on & off, but it's independent of that...So, what's going on? Please don't let it be more injector BS.....
This issue has been showing itself since early fall when temps were only in the 40's & 50's Farenheit overnight. What happens is this: I start the truck (early 04 5.9, stickshift QCLB) and it will bring itself up to idle. Then there's a slight stumble that you can hear chug like once. The RPM drops below 500 for a second and then it recovers itself back up to about 750 or 800 rpm. A minute or so later, there's a larger & more noticeable skip and it'll almost choke itself out and then it'll recover back up to 900rpm and there's a huge puff of black out the exhaust.If it stumbles bad enough, it won't recover & then stalls. It'll start right back up no problem, but it goes right back into that same cycle. If you try to drive away (because once the truck is warmed up, this problem goes away), it'll act like it's not getting any fuel at all and stumbles & chugs. Then all of a sudden it gets enough fuel & there's a huge black cloud and a puff of white in the middle of it... after it takes off accelerating etc. Now that the overnight low temps are in the 20's this has become a real problem where I can't even leave the end of the driveway for fear of it stalling in front of a school bus etc. When I come up to a stop sign, it tries to die, etc. Like I mentioned, however, once you get on the highway & get it fully warmed up, the problem goes away & it idles just fine.I am trying to correlate this to the grid heater cycling on & off, but it's independent of that...So, what's going on? Please don't let it be more injector BS.....