Porsche 911 2.4t mfi high idle

[pud]

Hi , I have a Porsche 2.4t mfi . 1972 , it starts well and idle is at 1000 rpm but when warmed up The idle goes up to 1500 rpm on its own , any idea what might be going on , thank you .

[RSTarga]

Is your hand throttle all the way down?

[tobluforu]

Also, do you have the mfi thermostat heater hose connected?

[Tyson Schmidt]

Check that the vacuum retard on the distributor is working.

[tobluforu]

One last thing, if you have not looked at CMA and gone over that at least 50 times, best to start there.

[pud]

Thanks for all the help , on inspection of the advance and retard, all fine and working , but checking the small rubber hose from the carb to the distributor I found a T piece connector and a small amount of hose coming off it going nowhere, removed the T piece and joined up the pipe , all working well and idle is at 1000 rpm ,

[gptom]

T is to connect left & right vacuum sources then to distributor

[pud]

Ahh , thanks fir the help , I will connect back up to left side mfi stack , it must have just simply come off causing high idle ,