just wondering what it could be the car has no power doesnt down shift (its an a4) the car only has 50,000 k's on it also it sututters and hesitates at high rpms time to change the spark plugs perhaps? any ideas would be much apprecated

 

I'm having a very similar problem. Couple of weeks ago I start feeling a power loss, the car seems to hesitate when I accelerate from a standing position. I cleaned my air filter & checked for a spark under the hood in case one of the wires was burnt (although its tough to get a good look) and didn't fix or find anything. I think I'm going to redo the Hypertech 3 programming. Post back when you figure out your problem.

 

Also check fuel filter and coil....and scan the car for knock retard when those problems are happening that is a possibility too if you have a miss and it is causing knock, I had knock AFTER plugs, wires, opti, and fuel filer and an LT4KM helped it alot. Good luck

 

I installed new plugs (all but one) the other day, that corrected the hesitation & rough idle. Then I put in a new PCV valve & that seemed to help restore the car to normal power levels. I'm going to put in a new fuel filter this weekend.

I have to move the header to get the first plug on the passenger side in can anyone tell me if I should pick up a new gasket before I start?

 

I say change the spark plugs and fuel filter. Then see where your at. Mine would "break up" at higher rpm. Replacing the opti fixed that for me.