Check Engine Idle Speed
WARNING: This page is about a different car, the 1995 Ford RV Cutaway, 1995 Ford Econoline, 1995 Ford Cutaway, and 1995 Ford Club Wagon. However, it is still accessible from the selected car via links, so may be relevant.
Using tachometer, check curb idle speed. Idle speed should be 600-700 RPM in Neutral (M/T) or Drive(A/T). If idle speed is correct, go to next test. If idle speed is not as specified, adjust as necessary and go to next test.