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Yo Siggy,
Idle Air Control (IAC) Sludge; Poor Idle TSB 91-25-07 for 85-92 Bronco & F Series & many others;

"...Hard cold starts, hesitation and stalls on initial start-up or during idle or decel may be caused by sludge in the throttle body and/or idle by-pass valve. Sludge deposits or oil film on the throttle body bore and plate or the idle air by-pass valve may cause one or more of the following conditions. Hard Cold Start, Stall On Initial Start-Up, Stall During Idle, Stall During Decel, Rough Idle, Rolling Idle... Cleaning is not required on sludge tolerant throttle body designs released for 1991 and newer model years." Some owners have cleaned these anyway due to age and grime that lezks past intake.

Try a Self Test for Diagnostic Trouble Codes (DTC)s by my pal, BroncoJoe19 @ Code Reader.....

See my Vacuum leak test in post #11 @ Help with dtc codes and idle

High idle with no applicable codes is usually caused by a vacuum leak,
 
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