Hello Gents,
Firstly I will apologise I'm not mechanically minded at all...
My 72 Pi 6 had an engine rebuild 2 years ago and have down maybe 5k in it since without any issues. It went in for an oil service and I changed leads to flamethrower red rotor arm plugs etc. When I got it back it seemed fine but started to firstly backfire then mis in low revs in second and third mainly when going through towns etc but would clear when in fourth and higher revs. Had it back and checked out but problem still there, seems more when under load. The metering unit was all reconditioned at same time
