Hello I am new to the site. I bought a 97 GTP back in march and it took me a month and a lot of wrench time to get it on the road. The car was running okay till I changed plugs and wire and the oil and started running 91 because the previous owner ran 87. Just the other I was in town driving around then all of a suddenly car stalled out. So there I was sitting on a major street trying to get the car going again finally I did got pulled off to the side of the road and them a buddy of mine came and looked at it and said sounds like a fuel pump or possibly a MAF señor. So after a long night of the car acting up I had someone pull me home and then this morning after talking to my machanic he said sounds like your MAF señor is not working right. So I started up the and it ran fine like nothing had happened so I went and got a new señor put it on and the car seems to run better. Then the other issue I had tonight was when I stepped on it it would sputter but still would go fast. Sounds like a clogged cat to me any suggestion would be great to correct this problem