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first thing that comes to mind would be the throttle positioning sensor, or the mass air flow intake sensor on the air intake hose assembly.Symptoms of a mass airflow intake sensor would be very poor acceleration or engine dying when gas pedal is mashed hard. Throttle positioning sensor can give you and irradical idle while sitting still. You might want to have a scan to diagnose the problem.
You know I had that problem on a 94SW, and replaced the Mass Air Flow doodad and the crank position sensor and that fixed it. Cannot tell you which item was the right one, neither are very expensive. My car however also had a gas odor to it indicating incomplete combustion.
try cranking engine while holding gas pedal to the floor, this turns off the fuel injectors to clear excess fuel from cyls. eng my just be flooded. may need to crank for a long time. if engine starts do not let off gas until you are sure eng will run on its own.
Replace The Throttle Positioning Sensor...When you put Accelerator to the floor ... It rolls the Position Sensor Cam to tell computer etc to put Injectors Etc..into cold start mode...as soon as the motor fires..injectors take over and do their job..The Black smoke is the Extra Gas Put it cylinders to Purge it in a cold Start Mode...Throttle Positioning Sensor..and Yes You Can do It.!!! AutoZone-O'Reillys Etc..Easy Fix !! And Remember Castrol GTX-5-30/ 10-30 !!!
For God Sakes DO NOT Run 5-20 Or 20-50 Tooo Thin- Tooo Thick !! -Thanks-Matthew
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