Chainsaw Repair

This thing is driving me nuts. Saw will start and run high end but will not idle worth a darn. About the only way I can get it to idle is with the low spd needle way out and then it's very erratic. Have soaked and cleaned many times using everything from 2+2 to a new ultrasonic purchased just for this reason. Recently installed a Walbro carb kit thinking maybe I was missing something with the gaskets and diaphragm that I couldn't see. I've adj. the metering lever as well as I could and the kit had a new needle included. Sprayed WD40 around the mounting base, checking for air leaks while it was running and it made no difference. The saw no longer has points and cond. but a universal ignition module that I replaced because I'm running out of options. The first one was installed around 10 yrs. ago and worked perfectly. New one made no difference. The saw is a CS500VL, not in the recall range, and if it wasn't for this PITA problem, I'd be happy to keep using it.
Any help would be greatly, GREATLY appreciated.
Thanks, Bill


Did I mention greatly appreciated?
If I posted this in the wrong area, I apologize. Tried the Echo forum earlier and got no replies

Yep you might consider replacing the carb.   I would also pressure and vacuum check the crankcase before replacing the carb.