Thread: Car sputters when accelerating hard

Thanks for the replies everyone. I went and bought spark plugs. I couldn't get them in my self, because you pretty much have to move the engine forward a few inches to get at the back ones. I took it to a local mechanic and he suggested I get the CAT replaced first. He use to work at the dealership down the road and said he thinks my CAT is still under warranty. He called the dealer for me and sure enough, the cat is warrantied for 8 years/8,000 miles. Even though I bought this car used without a warranty, they still warranty the CAT because of emmisions. The mechanic at the dealership checked out the car and thought it might be the CAT to. He wasnt a 100% sure, but they will be replacing it tomorrow.

If this fixes it, I will let everyone know. Otherwise I will be trying the MAF sensor. Thanks again everyone.