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Originally Posted by rxm6
One of the best tools I ever bought was an OBDII reader for my laptop. It does things like monitor in real time whats happening with my car. So if your o2 sensor has a flat spot it will tell you. Also things that you don't normally think of like an engine temp sensing unit going bad...it will tell you.
Falling flat on the face sounds like hesitation. When I had a bad knock sensor I would get that same flat on the face feeling but in the lower rpms...most notably between 1.5 k and 2k. You may just be experiencing your retarded timing at a different rpm range.
But do pull your codes and let us know whats up.
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what program r u running and where can I get it?