I recently completed an AOD to T5 transmission swap in my 1992 Mustang GT. The swap went smoothly overall, but I have encountered an issue where the engine does not rev past 3,000 RPM without experiencing popping and misfiring. However, if I disconnect the transmission harness or depress the clutch while holding it, the engine can rev freely without any issues. I am seeking assistance from anyone who may have encountered a similar issue after performing a transmission conversion.