Posting this for my cousin. He only posted it in the florida forum section and i wanted to move it here to help him out. thanks in advance for ya'lls help!

here it is:

I have a 98 SS with 123,000 on the drivetrain and only bolt on mods. The past week i noticed a flutter while driving on the h-way around 70mph, the rpm's would flutter up about 100-200 rpm. It would do this a few times then go away, then last night the fluttering became more frequent and the rpm's went to jumping about 500 rpm. Babying it down argyle road the fluttering starting to happen at 40-65mph where as b4 it was only h-way; at a stop light it was sluggish out of first and continued the fluttering here and there back to my house.
I researched the probelem and some say the tranny is going out and others say its the shift sensor. If its the sensor or a sensor great, if the tranny well a dent in the pocket but a new 4l60e and bigger stall is exciting to think about.
Anyone have anything similar, or when your a4 went out did it have any of these signs.
Also, anyone know of a good place for a new 4l60e in the jacksonville area.
Thanks

 

Is it flaring during the shifts? Or does it flare when you're cruising only? If it's not flaring during the shifts, I would think it's an electronic problem and not mechanical. Try some MAF cleaner. Seriously, you'd be surprised how a dirty MAF can actually be responsible for destroying the transmission. It sounds more like a throttle sensor problem to me...but I'm no expert.

 

he said it shifts just fine, it just does it while he's cruising. i'll tell him about cleaing the MAF. thanks for the tip! any other ideas?

 

When you say sluggish taking off in 1st could it be that its taking off in a higher gear?

 

you think that it might not be down shifting? what would cause that?

 

Thanks batman for the repost here; no it shifts fine its just when cruising in OD that the car seems to have the fluttering problem. this started last year when i tried to use my cruise control and it fluttered here and there rarely on the h-way at about 70mph (about 100rpm) but in a few weeks it went away. recently I tried to use the cruise control and to my suprise the fluttering started again, but now it has only gotten worse. last night was when all the problems erradically started (200-500rpm) and I have not driven it since then. the car has been scanned and there are no codes being thrown.

 

Go to Advance/Autozone/Napa/whatever and get a can of MAF cleaner. Take your MAF off your car and spray it down several times. Let it dry for 15 minutes.

Also, get electronic parts cleaner and clean your IAC sensor and your TPS sensor.

That's where I would start. Small parts, easy fixes first.

 

iac sensor where is that located?

 

never mind found it

 

You may also want to consider plugs and wires this also sounds like converter locking and unlocking as they do with engine missfires.

 

just replaced the plugs and wires a week ago

 

I had the same problem, and then pulled O2 codes. Unplugged the O2's and tuned it to run in open loop and it hasn't done it since then. Closed loop was causing misfires for some reason.

 

Yes O2 sensors would be another thing to check along with injectors,

 

i will be trying everything before i go to the drastic move of pulling the tranny, thanks for all the help with this one guys. I'll keep it posted till the problem is fixed.