Thunderbird Chugging/Missing While Driving
About a month ago I purchased a 97 Thunderbird with a 3.8 liter V6 and 116K miles. After a week of consistently smooth driving I started the car up one morning to find it chugging as I drove. Now, I knew that the temperature gauge was so I assumed the gas gauge was as well. I was running out of gas so I rushed to the station and filled up. It was too late and the damage was done. It didn’t help.
As a matter of fact it progressively got worse chugging throughout it’s range of speed. It would also loose power sometimes unable to go over ten or fifty mph or take a hill. I took it back to the dealership where they replaced the crankshaft sensor, fuel filter, and blew the lines clean. It did better for part of a day and went right back to it. During this time I doctored the tank with seafoam and discovered that it seemed to temporally relieve the car if I turned it off and then back on a few minutes later.
I started to think that maybe the catalytic converter was jammed up because the car almost seemed to be choking for air as I drove it giving it that chugging feel. I took it in and had the three converters replaced with a single. This helped with about seventy-five percent of the issues. Three weeks later and fuel injector and fuel system cleaner with each fill up and I’m still stuck with a lighter chugging that comes and goes daily. It’s an annoyance I’d like to get rid.
I’m not entirely sure what to do next. I'm thinking about replacing the in-line filter again but what else can be causing this? I’d appreciate any and all feedback you guys can give me.