unstable idling and rough starts

my 99 2.8 has trouble starting once in a while. it feels like it doesn't
want to catch and then it idles real high. other times it starts normal
but idles high. I can not reproduce it nor can I predict it. I have had 3
or 4 mechanics look at it but they couldn't find anything wrong. when the
computer is scanned nothing shows up. Anyone experience this? I'm starting
to think its the computer. If it is will a mod chip rectify the issues?

"jprusso" > wrote in message
lkaboutautos.com...
> my 99 2.8 has trouble starting once in a while. it feels like it doesn't
> want to catch and then it idles real high. other times it starts normal
> but idles high. I can not reproduce it nor can I predict it. I have had 3
> or 4 mechanics look at it but they couldn't find anything wrong. when the
> computer is scanned nothing shows up. Anyone experience this? I'm starting
> to think its the computer. If it is will a mod chip rectify the issues?
>

have you changed the battery or disconnected it recently? it may need the
throttle body re calibrating,

Steve.

"jprusso" wrote
> Anyone experience this? I'm starting
> to think its the computer. If it is will a mod chip rectify the issues?

Have you tried cleaning the throttle body?

Pete

i have had the throttle body cleaned 3 or four times. this happens very
speradically. audi service department says there's nothing wrong.

j,
OK, so you have an Audi..............
If it's a 5k/100/200, I can tell you it can be vacuum leaks, injector leaks,
temperature sensor problems, vapour lock, bad gas, fuel pressure problems,
check valve leaks, etc. etc. etc. Try: www.sjmautotechnik.com
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)

"jprusso" > wrote in message
lkaboutautos.com...
> i have had the throttle body cleaned 3 or four times. this happens very
> speradically. audi service department says there's nothing wrong.
>

"Steve Sears" wrote
> j,
> OK, so you have an Audi..............


Steve,

I guess you didn't catch the beginning of his thread. It looks like he's got
a '99 2.8, which I'm guessing would be an A4 or A6.

Cheers,

Pete

A4 2.8 quatro