Originally Posted by gregthomas07gt

I bought mine with the cai and tune already installed. It ran perfect and then 20000 miles later it started. So I don't think it's the tune. Mine does it when it's hot too. 1st gear lunges in parking lots, stumbling at low rpms, feels like the a.c. is kicking on and off while accelerating, just generally a rough acceleration, hesitation and lurching but not rhythmic like a dead miss. The best way I can describe it is like driving an older car with a sticky throttle cable. A battery cable pull clears it up for a few hundred miles then it slowly comes back. I've cleaned and sealed and tested til I'm blue in the face. Changed anything and everything and spent money on parts that didn't fix it. And we are not alone. Do a Google search for S197 hesitation... hundreds off forum posts and most are left unanswered.

Originally Posted by mtgldr

It definately seems to be a "learned" issue. Each time I clean the TB it goes away for a day or so. Pulling the TPS had it gone as well but it came back. I may try erasing the KAM when I get home tonight and see if that makes any difference in the AM.

Originally Posted by gregthomas07gt

What is KAM? I can also pull the fuel rail sensor and put it back and it will go away temporarily so I replaced it. It still came back though.

Edit: Never mind... KAM = Keep Alive Memory.

Originally Posted by mtgldr

I used the SCT tuner to reset the KAM and the stumble is gone. So I'm pretty sure this is a learned issue. I'm going to drive it a couple days, if / when the stumble returns I will reset the KAM again and see if it goes away again. Anyone else have the ability to reset their KAM to see if the stumble goes away for a day or so?

Originally Posted by gregthomas07gt

I'll give it a try this afternoon.

Originally Posted by mtgldr

It's one of the functions not in the programmer mode section of the tuner. I'll plug mine in and see what it's called. It's doesn't say KAM in the tuner.

Originally Posted by Jaydubau

Did you get a chance to plug in your tuner and find out what KAM is called?

Thanks