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I HAVE A 2001 SPORTTRAC,STOCK AIR FILTER. I INSTALLED A SPACER,AND WHEN AT 1100/1200 RPM IT IDLES WELL.WHEN I PUT ON THE BRAKE AND IN DRIVE THE IDLE DROPS TO 700 OR800 RPM,TO APOINT WHERE IT SPUTTERS AND WANTS TO STALL. WHEN I RAISE THE IDLE UP,TO COMPENSATE, OBVIOUSLY IT IS TOO MUCH. ALSO...