2003 6.0 throttle body question

rod7515 said:

I have a 2003 Yukon Denali with a 6.0. There I a plug for the wiring harness that pushes in the front corner of the throttle body. About every 100 miles or so while driving my traction control light will come on and I loss all power. The vehicle goes into creep mode. I will pull over, shut off the vehicle, open the hood and jump up on the bumper and wiggle that connector. Clos the hood and start it back up. Traction light will be off and everything is back to normal. Now it will set a throttle/pedal position sensor switch A/B voltage correlation when this happens. I’ve gone to the salvage yard and found another plug but off an 5.3 and cut off about 4” of harness with it but the wires look slightly smaller. The plug looks identical. Should I worry about the wire size or go ahead a splice it in.
My other issue is a code PO300 which is a random misfire. This will set only when pulling a trailer and going up a fairly long incline with slight acceleration. I can not feel the misfire at all. Anyone else ever had this. Should I start another tread on that code issue? I want to correct these issues as I get tired of the check engine light on. I do plan on checking the plugs as I don’t know how long they’ve been in. The previous owner did change out all injectors, wires, plugs but it’s been 40k miles ago. I’ve only had this vehicle for about 5k.
My last code is a P0420 which is car system efficiency below threshold bank1. I am changing out all 02 sensors tomorrow.
When I bought this it was setting a lean bank 1 and bank 2 but I corrected that with a new MAF. All other codes were in it as well when I bought it.
Thanks for any help
Rod

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