Conversation Between Raaaaaaaaaay. and Marty617

Hi there, I'm new to this forum, but noticed you're the biggest "poster" to this page. I have a question for you...going you can help. I have had my 07 Fit for the last 125000 miles of its life and love this car. Lately, dealing with rough running and engine coil miss fire codes...however, when replaced, fine for a bit then rough again. Replaced spark plugs and new coils...same story. Mechanic told me today, wiring harness is going bad and he can manipulate the codes by holding certain wires...so I'm inclined to trust him. What would my options be at this point...I'm being told it's a $1000 job...(?) Any input is appreciated...I'm going to try and post this publicly, but haven't figured out how to do that yet