Ok so last night I was driving home from a red sox game and I had a buddy with me. I decided to step on it just because. First gear went as it normally does and second gear made it to about 5000 rpms and it sputtered. After I shifted to third it was fine. This isn't the first time it's happend. It's always when i'm really steppin on it and its at high rpms. The car sputters and it seems like it hesitates and it keeps going. I've been told it seems like a tune issue but I don't know. Any suggestions?

It's a cobalt ss/sc with a stage 2.

 

check and re-gap plugs

 

Sounds like Spark blowout.

Does the car feel like it hit a brick wall.. then keeps giong like normal?

 

Nope, just a quick sputter and it hesitates and keeps going. Doesn't happend every time.

 

+1 first quick and easy check. So no CEL when it does it huh? you sure you're putting in 91 octane?

 

whatever the most expensive is other than diesel i buy .....i forget....i thought it was 93 for some reason....so than it probaly is 91....

 

Spark blowout prolly. As long as it doesn't happen very often, you are prolly fine. Just gap you're plugs correctly and you'll be good.

 

You are telling this guy how to gap the plugs correctly when you gap Rydis balt SPARK PLUGS to .20 huh!?!? ....

 

I hve this exact problem.. it happens about every 5th or 6th time i step on it.. scanning with hpt i can only see the reaction to it happening.. I can't find the cause.. it's very frustrating

 

i was told it also sounds like a possible spark plug wire or I need a new boot for the spark plugs.

 

Spark plug Wire hugh lol... Well i am also having this ssame problem .. kinda feels like when u drive onto the berm on the freeway its like bump bump bump but it still continus to climb into the rpm's and mine barley ever happens( compleatly stock besaides header back exhast and intake... so i dought its ur tune)

 

there are no spark plugs wires on the lsj .... we have coil packs on plug. in that case it could be a bad coil pack.