maybe misfiring?

[joholste]

Ok so i put a fuel system cleaner in my car and ever since then it sounds almost as if my pistons aren't firing right. i really notice it when i'm running at about 65. is there something i'm missing. could something else have been thrown off. i mean i literally haven't had a problem until i did that....also is there some way that i can easily fix this??

[mcgusto82]

try and finish the tank of gas you have in now. maybe the fuel system cleaner messed something up.honestly, i don't see this being the case. i usually add one when i change my oil. if that doesn't work, put your stock intake and it's time to pay your freindly GM dealer a visit.

[Atomb]

did you add it to a full tank?i will put a bottle in just before i fill up my tank. that way the filling process does a good job mixing it.i would fill your tank again to dilute it further before panicing...

[Raven]

If it was misfiring, the computer should detect it and turn on the check engine light. I'd wait a while and fill the tank with fresh gas, then see what it does.