idle drops off at stop lights

[Kurt]

When i have the car in gear the idle will start to drop of (lobe down, gradually decrease) and then cut off. the car will idel fine in park. what are some areas to look at.
Timming ?
vacum leak?
head gasket?
please direct

Kurt

 

[Kurt]

1973 351c c6

 

[krash kendall]

Fuel delivery.

 

[Kurt]

so fuel filter would be first thing to check

 

[grego37]

Id say double check/adjust timing,
then focus on the carb.
idle circuit
air/fuel mixture
look for vacuum leaks

 

[2nd Mustang]

Idles fine in park but not in gear? I'd say check idle speed.

 

[pabear89]

Depends on what its doing,
is it loading up?......running rich and flooding out.
Is it hard to restart?
or does it restart with a slight turn of the key.

Off the wall guess.....search for a small vac leak.

PB

 

[D.Hearne]

His problem is the reason Ford installed the "Dash-Pot" on the Autolite carbs.

 

[pabear89]

Yes and some were for Emissions also.
to let the throttle return slowly to idle to reduce emissions(BS)

And they have ones that increase idle speed for Acc when switched on.
From his symptoms of falling off idle, A vacume leak is where I would start to look.

PB

 

[whwright]

What kink of carb are you running? My first guess is that the idle mixture is too lean. That does strange things to the vacuum signal, which (on my cars anyway) makes the vacuum advance start to back off, which eventually lowers the idle speed enough to kill the engine.

 

[Kurt]

A little history I put to much silicone on the intake gasket causing the end seals to push out and I knew there was a vacum/ oil leak, so i fixed that and then posted thread, because the problem continuned.
I then replaced the spark plug wires as well as coil wire, when I removed the coil wire it broke of in the coil. I don't know why but afteri put the new wires on the problem went away.

 

[whwright]

Glad you got it fixed!

Wayne.