Random Hesitated/stumble on start-up

[JonZ71]

sounds like a fuel pump issue to be completely honest, i just think mine dies down haha

 

[1997chevydriver]

I have tested it a few times but every time I have the gauge i can't get the issue to show back up.......

 

[97SilveradoHD]

Well unless i got an ICM from the jy with the exact same issue...... It didn't fix it..

Ah that sucks...well thanks for giving that a try, now I'll look into something else being the cause.
So you're experiencing the same issue I'm having?

 

[1997chevydriver]

I believe so. Completly random but never happens when cold. Go to start and it cranks for 1-2 seconds then when it fires it stumbles to 600ish rpm unless you step on the throttle then it revs up and settles like normal.

 

[97SilveradoHD]

Yep sounds about the same. Stumbles around 100-200 rpm and then picks up to normal idle speed.
I'm surprised no one has had this problem and figured it out...

 

[1997chevydriver]

Any updates from anyone?

 

[97SilveradoHD]

no new updates, truck hasn't been stumbling on start up recently. However....I just swapped the original 0411 to a tuned PCM from BB annnd now it has a different issue. Truck fires up to 1000 rpm then it almost dies, idle then fluctuates for a few seconds and finally idles smooth. This just started after swapping the PCM...ugh!! If its not one thing it's another I guess

 

[97SilveradoHD]

Here's an update. browsing craigslist every night for something like this....
http://reno.craigslist.org/cto/3830786547.html