turns out i had another hose towards the end of the fire wall that was old and just melted. mechanic changed it for me hose and labor cost me $60.00

 

And how is she running now?

 

so my issue came back once again . I'm leaning towards my o2 sensors or the maf

 

You can try cleaning out the MAF. It will be cheap, and will likely tell you whether or not that's your problem. You can purchase MAF cleaner at most local part stores.

Either that, or if you have an auto wrecker nearby you could always go there and see if there are any B5 A4's or Passats that you can take some parts off of.

 

she's running better but she still shakes between 45-60 mph .slowly but surely

 

Coil packs are a common failure and cause misfires, I replaced mine at least 3 times on my old 01 1.8t. Have you looked in to that? There was a recall on them so may be able to get a set for free from the dealer, I did.

 

If all of your pistons are misfiring, I don't think it's coil packs unless they all failed simultaneously. Are you still getting codes? If so, what are they?

 

I don't have the misfires any more. the shaking lessen after my oil change. my coil packs are new. been looking for a used maf , nothing yet. going to change my o2 sensors then maf. but it looks as tho I need to get my fuel injectors cleaned or looked at. thanks for all the advice. will keep you guys updated. many thanks.

 

sorry took so long, to reply . while trying to change the maf sensor i notice the check valve was broken. so i decided to change that piece first to see if that was the root of my problem, i let the car run for a couple of days and the check engine light havent made a comeback yet.

 

I recommend buying the 02 dummies instead of real o2 sensors. Leave your old ones in. In my experience, removing o2 sensors ends in failure. You can end up stripping the thread (like I did even after pb blasting it and heating it up with blowtorch).

Because I stripped the thread, I had to use a cold-weld to keep the o2 sensor in place. A cold-weld is like metal cement, best way to describe it. Its a mixture of cement and hardener in a plastic canister. I hope you don't remove the sensor because you might end up doing the same thing I did.

Now with the 02 dummies, you just plug them up under your hood to the corresponding sensor and your good to go. They will fool your ECU into thinking everything is okay, guaranteeing the best fuel/air ratio.

I would replace the coil pack with the lines also. You never know.

Clean that MAF.

You should check how much the knock sensor costs for your motor, a failing sensor is often the culprit. You might have gotten a different code for the knock sensor, if that was the problem, but my point is if the ECU doesn't know where the piston is, it cant possibly open and close the valves correctly.