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i have a 5.0 v8 out of a 89 f150 in my mustang and it has started to slowly increase the idle as time goes on starts out at about 1500 and increases to about 2000 when it warms up shows a code for the idle air control and the throttle pos. sensor but they are both in limits no apparent vac. leaks either should i just start replacing sensors other than this it runs [email protected]
 

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Friend of mine has an 89GT which goes haywire every once in a while too. He uses the maintenance manual procedure which is somewhat involved, to set all the electronic control parameters back to spec, and the problem goes away. Perhaps doing the same thing will make your engine happy.
 
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