91 Ford Mustang "Jumping" Problem

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k.friedline@gmail.com - 25 Jul 2006 06:18 GMT

Hi,

I just purchases a used 91 Ford Mustang LX with 94,000 miles on it.
Everything seems to run fine on it except when I try to accelerate at
any other speed except "grandma". When I step on the gas coming from an
idle the car either "jumps" forward receiving gas and then not and then
again...ruhhh ruhhh ruhhh OR it will just stall. If I am extremely
careful with the throttle I can avoid this problem.

Is this some sort of airflow problem? Is it fuel related?

Before I bought it, the owner put a brand new airflow sensor on it and
reprogrammed the computer. I looked at the sensor and it is brand
spanking new.

I am not sure what to do first. It can be dangerous if it stalls in
mid-traffic, but mainly it is more annoying than anything.

Please Help!

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Chumley - 27 Jul 2006 05:50 GMT

> Hi,
>
[quoted text clipped - 15 lines]
>
> Please Help!

That is the gizmo that bolts onto the side of the throttlebody. forgot what
it is called, but it has two wires going to it, and it modulates the
airflow, to keep the idle OK. has holes in it that bypass the throttle plate
in throttle body (recalling from 5 year old memory, if I had a diagram....)
I just cleaned out the inside real good with carb cleaner (book says not to
do this, but it is all metal parts inside)
My stang stalled when stepping on the gas, cleaned this unit up and it ran
fine after that. It gets dirty from some of the crankcase exaust that is
fed back into the intake. It has a small gasket too, no problem. This
could be an easy fix for you. I had an 89 and have a 93 supercharged 5.0

Next part would be to replace the fuel filter, anyway. Then get the
injectors cleaned.
94K is nothing, I ride them out to 160k easy.

he may have screwed it up with new AF sensor and why reprogram computer? no
need

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