well there is this hissing sound, and after the car shuts off, there is this hissing sound under the hood for about 30 seconds. well could i get the fuel filter off, with out taking the gas tank, and if i need to do that, how would i do, anyone got any diagrams or pics or instruction, thanks alot guys, to this point you helped me alot, thanks in advance

 

The search option is your best friend. Look here for a general vacuum diagram : https://www.audiforums.com/m_529162/tm.htm

Also the best resourse for almost anything Audi is: http://sonolithics.com/files/a6_links.html

Vacuum hoses have been known to suddenly fall off. My old Saab 9k used to blow off this one hose all the time, causing the idle to get fuc*ed up. The best thing you can do is spend the next two hours or so following every vacuum line you can see and seeing if it is in good condition or not.

 

thanks jeff, you've great help, thanks alot, preciate it

 

does the vacum line go around the whole car or just around the engine

 

the hissing sound could be your radiator
i knomw mine does it on my truck and thats brand new
just odd things of the car world i guess
so dont focus on the hissing sound too much

check your fuel lines
and your vaccumn lines under your hood.....start at your M.A.F. and work back
good luck

 

well fuel line is good the gas has good flow, i was thinking that the fuel filter is clogged up, but i m wondering how would i get it off the tank

 

where is the mfa

 

my dad is saying that the engine computer might be going bad, would something like that cause the problem?

 

I highly doubt your engine computer is bad. You need to check your fuel pressure with a fuel pressure gauge. Find a buddy that knows how to do it. You obviously have enough fuel pressure to get the car to 3k, but do you have enough when the engine is loaded at 3k? The ONLY way to test this, is with a fuel pressure gauge. What specifically does your car do at 3k. Does it just shut off, does it miss then die, if brought to 2999k and you take your foot off the gas does it recover or still die. Does it start immediately after dying? Be very specific on what it does at 3k, and how it dies. Is your check engine light on?

 

Ok, so the car starts up choking a little, but it starts. It gets up to 2999k and if let it go, than it recovers, if i get to 3 or more, than the car shuts off like its choking and than i try starting it up and than it starts up.