99 SLE misfire problems
I have a 99 SLE bonneville, non-supercharged. I have a check engine light, which I got scanned at Auto Zone, which gave me a "general" ignition fault code. My bonneville, misfires around 25 to 30 mph, and is running slightly above the usual RPM'*. For example it usually is about 2100 RPM'* at 70mph, but it is doing about 2400 RPM'* instead, killing the mpg'*. Any help would be appreciated, I did own a 91 Bonneville before and changed the electronic package (like a distributor), and that fixed it, but I wanted some feedback before I try that route.