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Message: [QUOTE="LiftedBlackHD, post: 992971, member: 5639"] Truck is becoming hard to start and idles rough. While idling the cab bounces up and down mildly. I did some tests today and the findings are as follows: At idle I am getting 13.8-13.9 volts at the batteries and 13.9 volts at the alternator measured with the voltmeter, with NO acessories on. These numbers drop to 13.2-13.3 and 13.4 respectively with all acessories on. According to my SCT at idle with everything on I am getting 13.0. With acessories off it jumps to 13.7. I tested the FICM and I am getting about 47.5 with key on and at idle. I then pulled the ICP sensor and there is no noticeable change in sound or RPM at idle. Plug it back in and again no change. I tried this several times with negative results. The ICP was replaced a few years ago. When it went bad the first time the idle was jumping up and down and the truck would die. It is not currently experiencing those symptoms. Just a steady rough idle. According to my SCT there are no DTC's. Any opinions? Thank You [/QUOTE]

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