Hey guys! I'm new to this forum. I have a 2006 commander 5.7 limited. And recently some strange things have been happening. About a month ago as the weather got a little colder the idle would start to hit about 12-1300 rpm and hold their for a few seconds until it gradually comes down and then dips below 400 and comes back up to idle at 675. Its acting as if The butterfly valve in the throttle body is slightly engaged and it holds their until it closes. Looking at STFT. (Short term fuel trims) when the idle increases the fuel is being dumped into the cylinders. When it dips back down below 400 their isn't enough feul. And then is compensated and calibrated to keep the standard steady idle. Tapping on the throttle body has no effect on what's happening. And with a screw driver can hear the injectors firing. I've replaced plugs about 2 months ago. It has 166000 miles on it looking under the vehicle on the passenger side I have a blue wire hanging down. It is a chasis ground and I cannot figure out what this wire connects too. For some reason I feel this has some sort of relevance to what's going on. Its on the left side of the cat and does not connect to the 02 sensors. Any input can be greatly helpful thanks! Their are no MIL or DTC's. I did notice that when the rpms climb their is a lightning bolt light that comes on the dash for a split second and goes off. I think that's the TPS?