I had a few areas where I'd get flat spots or misfiring and the tickover was very erratic. I made sure the tappets were correct, put in a new Valtec type chain tensioner, new rubber manifolds, tightened exhaust header clamps and did a TPS/TB reset/balance as per the book. It's still not perfect but it's not too far away, I can put up with the odd hiccup as other than that it goes like the clappers.
I also built up a Cliff Jeffries MyEcu to replace the 16M altogether and with that I can experiment with different maps but that's more of a work in progress at the moment.