stumble and die at idle....

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Shelldigger - 29 Jun 2008 13:36 GMT

90 Blazer, full size, 350, stumbles and dies at idle or when put in
gear at idle.

Have checked vacuum lines and replaced EGR valve and EGR solenoid,
still having problems. Motor runs fine once you get going. Im left
scratching my head. Any ideas?

I was thinking...maybe...fuel filter? ...but it runs great at speed....

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Shelldigger - 29 Jun 2008 22:49 GMT

> 90 Blazer, full size, 350, stumbles and dies at idle or when put in
> gear at idle.
[quoted text clipped - 4 lines]
>
> I was thinking...maybe...fuel filter? ...but it runs great at speed....

Oh, just put new plugs/wires/capand rotor not two months ago....

stopped up converter?

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Shep - 30 Jun 2008 12:43 GMT

Check and clean the idle air control and throttle body, the cat would kill
high speed power if bad.

> 90 Blazer, full size, 350, stumbles and dies at idle or when put in
> gear at idle.
[quoted text clipped - 4 lines]
>
> I was thinking...maybe...fuel filter? ...but it runs great at speed....

Oh, just put new plugs/wires/capand rotor not two months ago....

stopped up converter?

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Shelldigger - 03 Jul 2008 13:19 GMT

Now why didnt I think of that? Pulled the IAC, it was carboned up
pretty good. Cleaned it up put it back in, big improvement. Still has
issues occaisionally, will pull the TB and clean it up real good this
weekend.

Thanks Shep!

> Check and clean the idle air control and throttle body, the cat would kill
>
[quoted text clipped - 13 lines]
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> ---= - Total Privacy via Encryption =---

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Shelldigger - 17 Jul 2008 22:38 GMT

> Now why didnt I think of that? Pulled the IAC, it was carboned up
> pretty good. Cleaned it up put it back in, big improvement. Still has
[quoted text clipped - 25 lines]
>
> - Show quoted text -

Ok, finally installed a new IAC valve. Cleaned up the TB as much as I
could. Guess what...still stumbles and dies at idle. It will idle ok
for a bit, then struggle some, and idle ok for a bit, then struggle
some, and so on and so on till it just dies. Doesnt matter if its in
gear or neutral. Doesnt matter if Im applying brake either was
thinking maybe the brake was robbing vacuum/ possibly indicating a
loss of vacuum somewhere...doesnt matter. Same scenario. Have replaced
the EGR valve/EGR solenoid, now the IAC, has a virtually new set of
wires and cap/rotor/ even tried a fuel supplement just in case I had
crappy gas. Truck still runs great at speed, even when pulling a
load...but its irritating as hell trying to back a boat in the water
or stop at a stop sign etc.

Whats left to look at?

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SBlackfoot - 26 Jul 2008 17:31 GMT

> Ok, finally installed a new IAC valve. Cleaned up the TB as much as I
> could. Guess what...still stumbles and dies at idle. It will idle ok
[quoted text clipped - 10 lines]
>
> Whats left to look at?

Is the A/C turned on by any chance?

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bobby swift - 30 Jul 2008 23:06 GMT

spring broke in fuel pressure regulator
BObby

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