Racing idle in 1993 mustang - 1993 Ford Mustang

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HOT ENGINE? (ill guess hot)
idle surges.(hunts) (very simple reasons or very hard to find.
the car has 2 engines. G16A and G16B
they work totally opposite, (8valve and 16v)
the vin number tells you the engine type ,digit 8 is engine code
6= G16B 16v
U= G16A 8v
i have factory book. its in chapter 0 these facts.
the cause of idle surge and hunt are:
1: ISC failures. the ISC can stick partially open and then hunts.
clean it and test it . see videos of how.
2: engine running so bad the ISC can nOT regulate idle speeds.

#2 is caused by up to 50 reasons.
8v , air leaks, cause racing idle and iSC goes nuts.
16v , all air leaks cause lean and if too lean the ISC goes nuts.

by nuts , i mean it hunts or gives up.

the list is endless, but the tests are basic,
i cant help you because no engine stated.

http://www.fixkick.com/IDLE-AIR/idle-index-home.html


ISC = IDLES SPEED CONTROLER (a system not just a PART)

replece idle air control valve.....and start racing!!!

Don't know if you already solved your Mustang's problem...the Idle Air Control (IAC) valve could be dirty, or if not cleanable not to costly to replace...a vacumn leak would be a more consistent problem...your local parts store can help you with the location of the IAC. Hope this helps.

find your idle sensor tap it with a screwdriver if idle works ok after smacking it replace idle sensor cost for part usually about 50 dollars

Try getting the codes pulled at a car parts shop. Usually the computer will keep it in its history. It sounds like it is an ignition problem. If there is no stored code I would look at things in this order: spark plugs, ignition wires, distributor/coil. If none of these seem to be the problem you may have to take it to a shop. If it was just the start and idle problem I would say it is something with what I said but that high RPM thing seems strange.

if you're trying to hold the idle over 3500 , you're going to hit the Rev Limiter, Einstein. Racing cars will lead you to no good , son. If I'm wrong or missunderstanding you please clarify.

Did you put plug wires on it? Also these are good for having injector problems.

I'll tell you where or who might know. If you go to www.delkperformance.com and get their ph. # call them they may be able help you with that. they deal strictly in Ford Mustang parts and performance.