I don't see a newsgroups available for Chevy cars.
xposted to alt.autos.gm - that will get you some more answers...
I have posted here
> before and frequently read items from this newsgroup. I'm looking for a
> "second opinion" about a dealer's diagnosis. I took my '04 Impala (3800
> V-6) to the dealer this morning due to a faulty tach reading. Not a major
> issue, but I did purchase an extended warranty which covered this repair.
> I was thinking that they may replace a faulty stepper motor, which seems
> to be a common problem. The dealer advised that I would need a new dash > cluster,
> which would also be covered - $100 deductible payment only. Anyway, I
> also mentioned that about the same time that the tach reading failed, I
> also noticed that when the vehicle sat overnight, the first time you > stepped on
> the accelerator it felt like it was stuck. You had to push the pedal a
> little harder and finally the car would go. After that everything was
> fine - you could take off smoothly.
>
> The service writer quickly stated that I needed the fuel injector/throttle
> body cleaning service - a $129 charge to cure this problem. Apparently > the
> technician who looked at the dash felt this was the case also. I'm
> wondering if the faulty tach reading is related to this throttle issue.
> Could there be any possible correlation or does the need for a throttle > body
> cleaning sound legitimate? The car has nearly 50,000 miles on it. The
> service writer stated I should be noticing a severe drop in gas mileage. > A
> fair amount of my travel is on the highway. On a recent 300 mile trip on > a
> cold windy day, I got 27 miles/gallon in city/highway driving. I would
> consider that to be appropriate for the conditions, considering the crappy
> winter blend gas we have here in northern IL. I think the mileage ratings
> for this car were 30mpg on the highway. Any thoughts and/or constructive
> comments are appreciated. Thanks!
Don't drive 120MPH? :P