I have a 97 - same engine - very similar problem - at 1500rpms i get the slight hesitatation or kinda like a chuggling ..but start up, idling, accelleration, high r's all good...it is very specific and consistent..I'm gona try cleaning the fuel injectors maybe this weekend...please please keep any progress posted ..and I will do the same..if anyone has corrected this let us know..post or email me at s7falcon@yahoo.com or call my cell 203 520 3003 (Connecticut) anytime!!