A common problem in the EEC-IV controlled 302 Mustangs is a hunting idle. This is an idle which fluctuates in RPM up and down and up and down....It can be very annoying.
The EEC-IV is programmed to idle the car at 672 RPM. Incorrect throttle plate position is ithe primary cause of the problem in most cars. To adjust this, back the screw out until it no longer touches the throttle plate stop. Insert a 0.010 feeler gauge between the screw and the stop and turn the screw until it touches the feeler gauge. Then turn the screw another 1.5 turns. Then adjust the TPS (throttle position sensor) to 0.98V.
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