gm efi stumble

Joined: Apr 01, 2008 Posts: 1

Hi; I have a '91 suburban 2wd with a 5.7 efi motor. Off idle, it chokes itself and you can smell fuel. If you take your foot off the throttle it clears up. This also happens on the road at part throttle. It gets poor gas mileage. I have run the codes and get a 43. I changed the knock sensor, cleared the codes, but the 43 still comes up. It has new cap, rotor, wires, plugs, and timing @ 0. Compared to other 350's I have owned this one is a dog. Any ideas?

External Since: Jul 27, 2006 Posts: 464

Check engine vacuum at idle could be a restricted exhaust causing the engine
to run rich, possibly a bad coolant temp sensor you can scan that and see if
the sensor input to the ecm is the proper reading,.
"rogerd" <none RemoveThis @000.com> wrote in message
news:1112701_8a99e6b701a8eb38748bc4a554da4af0@autoboardz.com...
> Hi; I have a '91 suburban 2wd with a 5.7 efi motor. Off idle, it
> chokes itself and you can smell fuel. If you take your foot off the
> throttle it clears up. This also happens on the road at part throttle.
> It gets poor gas mileage. I have run the codes and get a 43. I changed
> the knock sensor, cleared the codes, but the 43 still comes up. It has
> new cap, rotor, wires, plugs, and timing @ 0. Compared to other 350's
> I have owned this one is a dog. Any ideas?
>
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