Bit of advice or help please if I may ask. Have a 1973 240z which originally had flat tops but the previous owner installed earlier Hitachi carbs without all the emissions paraphernalia. Car runs great when warm no flat spots and pulls throughout the rev range. However, with cold start it really is pants. Barely catches, and everything serviceable was renewed as part of the recomissioning in the year. Is there a procedure to adjust choke setup? Have tried to search the archives, but nothing relevant or substance came up. Thanks in advance.