This just started happening today when I was on my way to the muffler shop. Car was running fine and once it got up to operating temp it started loping at idle. Very regular in time with the exhaust. I thought "oh, it's finally starting to get mad about having the muffler hanging off". With all of the other rattling from the exhaust system it didn't seem like a big deal. Now with the new pipes on it seems even more pronounced. Doesn't feel like it's missing, my cutlass used to do that. It's very odd because it wasn't a gradual change, it just started happening all of a sudden. Do you think it's mad because I filled up with 87 for the first time? No SES either.
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