Chronic minor but annoying problem with my 1987 245 with B230F. On cold start after sitting for hours, it will turn over anf fire right up fine. Let it idle for a few seconds and it will stumble and stall. Occaisionally, it will start to stumble, but catch itself and then diel fine. If it is put in gear shortly after start up, it will stumble and stall. If it idles for more than 30 seconds or so, it is then fine and will be fine on any starts after that.

I've checked AMM and even swapped that out with a known good one. No change. Throtle body has been cleaned, idel control motor is working properly, all vacuum hoses are new and tight. Engine dile speed when warm is right on spec, and last emissions test passed with flying colors. What am I missing adn where should I look to cure this glitch ? Thanks.

MIke