greenehoosier
New LVC Member
My Mark runs great above about 2200 rpms, really screams. It will still bark the tires at 60mph. Anywhere below that RPM it is a real dog, I get a miss and a backfire. Under steady acceleration, under load, I get a miss. If I floor it above that RPM level it really lets loose. The only things I have done to it are new plugs (did not change anything) and the seafoam treatment. Any ideas? Yes, there is a CEL, but it has been on since I have owned it- before the problem. Is there a cheap code reader for these? Thanks!