SOLVED (mostly). Yeah, was the FD... good used one this time and works great. Now, lambda spot on, ALL new(ish) tune up parts, have a strange popping thru the exhaust in low gears above 3500 rpm, comes and goes. Perfect cold start, idle and power... just popping, like a lean miss. Thinking maybe another spectacular quality dist. cap is bad. Thanks for the heyulp.