rough idle and stalls at idle
 

1987 F 150, 4x4 automatic , 4.9 - Problem; idles rough and stalls out, runs little rough through out throttle ranges when driving. Test done; vacuum leak test checked good, timing check good, r2 wires and plugs checked gap and firing order check good, r 2 cap and rotor, R2 MAP Sensor, IAC , TPS, EGR feed back sensor. Note : seems to idle better at hot outside air temperatures.

Exactly what vacuum test did you do? What was the timing? What plugs are in it (brand, PN, source)? Same ? for each of the other parts? Why were each of them changed? What test did each one fail, and did the replacement pass the same test? WHEN was each part changed (time/miles, and relative to the appearance of this symptom)? When (time/miles) did this symptom appear? How is the truck built, and what's its maintenance/repair history? Click this & read the caption:

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