Would you say this "shudder" is a hesitation of the engine to accelerate if you "mash the gas"; or is the engine just acting like it is cutting out completely and then turning back on?
Does this shudder occur at a certain RPM point every time? (if so, what rpm?)
1) What transmission are you using?
2) Any aftermarket performance mods or bone stock?
3) What year PCM are you using and who custom tuned it (or is it stock)?
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[This message has been edited by Darth Fiero (edited 11-06-2013).]