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hello all. i have a 4.2 04 with 143600 on the clock. ive been having an issue where using large power draw such as windows or using heat on full blast or anything that highly draws power very suddenly will cause reduced engine power with code p2138 "Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation" which means the value of both sensors within the accelerator pedal do not 'agree' or correlate within their parameter. the issue does not ever occur without manipulating something that draws power (eg. only happens rolling up/down windows, turning on heat) my battery tests well, although i feel that an alternator not properly regulating voltage could be a culprit. ive pulled the accelerator pedal and tested it with a multimeter and it tested fine. recently ive been able to use my windows and the heat at the same time with not much of an issue until today i tried to start it up with the blower already on 5 and temp was on cold instead. the issue occurs as soon as the engine starts. as soon as the ac compressor is engaged after the starter solenoid shuts off, it draws enough power to make this happen. i would love to be enlightened by someone with ideas. thanks guys