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They help your motor breathe better and also make sure your Mustang gives top-notch throttle response. ... 2005, 2006, 2007, 2008, 2009 Mustangs; V6, GT, Bullitt, Shelby GT500, ... 2005-2009 Mustang GT Cylinder Heads & Valvetrain Components ... (6).Ford Racing SOHC 3V 4.6L Head Changing Kit (05-10 GT) $76.00.
Look on top of the block at back by firewall for PCV. Other things you may want to check/clean are idle air control valve on side of throttle body, as well as mass air flow sensor in intake air assembly. Clean IAC with throttle body spray cleaner and port it is removed from well, and try. Use tuner cleaner or electrical cleaner on MAF sensor . Sometimes just cleaning will cure it.
Durango would shift in and out of overdrive while driving at a steady rate. Replaced the throttle position sensor and fixed the problem. here are a few causes for a bad tps. transmission shift issues, bucking, jerking, idle surging, engine cutoff, hesitation on take off, surge while cruising down highway. have a good day ! tps is used by computer to monitor throttle position and adjust the speed, fuel and air to match throttle position. if tps is bad it will send wrong info. to computer. hope this helps !! if all else fails clean maf sensor. check tps first.
wheather your a2 .0 or 2.5 at idle key on engine off its is 0.7V to 1.1 V. you test it by doing a sweep, with your volt meter,voltage should increase with smooth throttle movement there should be no drop out or glitches and at wide open throttle you should reach 4.5 V , (***) wide open throttle