why is my car doing this

[sca555]

i dont know what it is but my 2007 grand prix n/a l26, when ever i accelerate or go up a hill it bobs down on me why is this?

every 3000 mile oil change, it has 68000 on it, transmission was flushed 2 months ago, radiator flushed, spark plugs and wires changes recently

somebody told me it might be a clogged cat, or fuel pump is this right

 

[cerick08GP]

spark plugs and wires changes recently

Well, just a guess but I would check all your spark plug wires. I’d bet you melted one of them.

 

[sca555]

i justed replaced them and it was happening before the change

 

[Bio248]

does it continually bog down or does it just bog and then shift..?

 

[sca555]

it continually bogs down, my mpg sucks also, no ses or check engine lights come on, the only thing im thinging it could be is a fuel filter or a clogged cat

 

[Bio248]

i was thinking clogged cat.