Problem: Hesitation/Lack of Power/Slow (Stumbling) RPM Increase on Acceleration from Idle or Cruise at Moderate Speeds. Occurs 70 - 80% every time. Can be Duplicated in Neutral in Garage. Condition occurs with Hot or Cold Engine. Vehicle always starts and idles normally, as if no problem exists
Parts Repaced in last 2 months: Fuel Pump & Sock Fuel Filter A/C Spark Plugs Dist. Cap & Rotor Spark Plug Wires Ignition Module (Coil Driver) MAP Sensor TPS Sensor
Injectors Chemically Cleaned 3X Fuel Pressure: 61 PSI (Pump Running) 58 PSI (Pump Off) 52 PSI (Engine Running at Idle) 57 PSI (Engine under Acceleration) Cam Retard at -7 degrees, CRK Learn - Successful No DTC's Set - No SES Light On All Grounds Checked and Seem to be Intact.
Scanner will indicate an indiscriminate random misfire, at times, on various cylinders, when cracking open throttle while parked, in neutral, when hesitation problem occurs.
Scanner indicates all other sensor readings normal and functioning correctly.
I am running out of hair to pull out, (and ideas), hoping for comments or suggestions.
thanks