[-FROG-]

1 - Check your plug wires once more. Make sure they are pressed in good in the back as well as on the spark plugs. I'm assuming they are all plugged in the right plug and nothing is swapped, since the car has a good idle..... or does the car idle really bad too?


2 - It is more than likely your MAP sensor. At least that's the most logical, easiest part to attack next. The "Manifold Absolute Pressure Sensor" (MAP) is located at the top most part of the intake manifold at the farthest part, next to the driver. It's a small black box with 3 wires at a connector on the end.

The "Power Control Module" (PCM - Computer) supplies 5 Volts to the MAP sensor. The MAP sensor converts intake manifold pressure into voltage and the PCM monitors this voltage. As vacuum increases, the voltage proportionately decreases and vice versa.

During "Key On" before cranking the engine, The PCM determines Atmospheric Pressure from the MAP sensor voltage. When the engine is "on" and operating, the PCM determines intake manifold pressure in relation to atmospheric pressure

AT WIDE OPEN THROTTLE - THE ATMOSPHERIC PRESSURE IS UPDATED BASED ON MAP SENSOR VOLTAGE AND INPUTS FROM OTHER SENSORS (maybe the TPS sensor?). AT THIS TIME THE "IGNITION CONTROL MODULE" (ICM) ADJUST SPARK ADVANCEMENT AND THE PCM ADJUSTS AIR/FUEL MIXTURE.

The Throttle Positioning sensor may be the actual problem (or adding to your problem as well) as it may be one of the "other sensors" mentioned in the statement above. It's located on your left / drivers side throttle body. When the throttle butterfly changes position, it changes voltage, sending a signal to the PCM, working in conjunction with the MAP sensor.

Check all those connectors and let me know if you make any discoveries. You should probably take the MAP sensor off and inspect it... or replace it. -FROG-