95 GP with 3.1 surging

"Mike Marlow" <mmarlowREMOVE DeleteThis @alltel.net> wrote in message
news:7e5d0$47feb7a6$45289785$30782@ALLTEL.NET...
>
> "Mike Y" <joe DeleteThis @user.com> wrote in message
news:ZQwLj.21$4R2.4@newsfe06.lga...
> > My 95 Pontiac GrandPrix with 3.1 is surging. Not bad, VERY subtle. I
> > have no error codes, other than EGR (I know I have a clog) but the surge
> > is under light acceleration, and the EGR shouldn't affect that.
> >
> > Anyway, I'm gonna try a soak-out of the EGR this weekend if the weather
> > is nice and I can work on the car. For the surge issue, I'm thinking
> > maybe
> > just shotgun with new plugs, and possibly test the wires to see.
> >
> > Anything else obvious to go for? If plugs don't help, I may just try
new
> > wires.
> > As far as I can tell they are original with 135K on them.
> >
> >
>
> Plugs and wires would certainly be in order for that car then. If that
does
> not fix it, check the TPS adjustment.
>
> --
>
> -Mike-
> mmarlowREMOVE DeleteThis @alltel.net
>
>

Well, I did some work Saturday before a trip and pulled a couple of the
plugs.
They looked fine, as far as I could see. They were Bosch Platinum. No
dirt,
no flaking. The wires were also Bosch Super something or other, and I
didn't
see any signs of cracking or leakage. I didn't go so far as to spray them
with
mist from a Windex bottle and then slide a neon bulb up and down, but they
seemed ok.

Anyway, I also pulled the digital EGR valves off. I started the car and
sprayed
carb cleaner in the intake. It seemed to 'open up' and start sucking. I
put it
back on and no 'service engine soon' light. Until today. Took over 100
miles,
and it came on as I got off the highway and came down an exit ramp after a
50+ mile run. So I may have to do it again.

Oh, I also put some injector cleaner in the tank, and the surging seems to
have
stopped. At least, I didn't notice it. But then, I didn't specifically try
to look
for it or set up the conditions where I know it was more likely to happen.
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