I have a 74 260z, I put all the basics on for a tune-up. Had a mechanic adjust the carbs. He suggusted running carb cleaner thru gas tank. Runs alot better. Hard to start when cold, acts like its flooded. Have to hold gas pedal to floor for it too start. Been reading threads on carbs. Checked to see if choke was working. Seems ok, but when car running and putting on choke, it doesn't change the engine at all. Any help?

74-260z

RLS30-011578

Make sure the choke cables are actually moving the choke lever. Have someone pull the choke as you watch the carbs. The choke lowers the jet assembly allowing more gas to the engine.

Did that last night when son-in-law (mechanic in the family) was over. We removed air breather could feel the choke moving. The only way he got the engine to stall was to cover the nozzles in front of choke.

The carbs are probably set too lean. You can't flood the carbs because there isn't an accelerator pump. Try and richen the mixture by turning the knurled screws clockwise as viewed from the top.

Thanks for the info, will try that tonight,