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Problems now: Main issue now is when the AC is activated, the idle fluctuates and when the AC is turned off, it dogs the system. Idle will remain low. I was having random idle issues with no AC but was fixed. Fixes: - Ignition Starter Switch - Cleaned Throttle Body and Plenum - EGR Valve -...

99 Mustang GT 4.6 Litre 180,000 w/ no mods Issues: Low Idle, Reduced performance, stalling, missing, ticking, ac issued etc... Repairs: New Air Filter, new IAC Valve(reset ECU for idle learning), new EGR Valve, cleaned MAF Sensor, new Spark Plugs, new Alternator, new Serpentine Belt, new Fuel...