need some advice,

[geraldchainsaw]

hi all,    let me lay a problem I'm having,    the car drove fine a week ago,  today I went for a ride an at every red lite while in drive it felt like it was going to stall,  had a chugging effect,   it idles fine,.    geez,  I forgot this is the 57 forum,    I'm talking about my mustang 69 mach 1 that I'm having the problem with

[mustang6984]

How old is the gas? First question that comes to mind. Might be time to take it out on the highway for a 1/2 tank drive...or more.

[rmk57]

  I had the same sort of issue in my 68 GT/CS. Checked all the fuel system, overhauled the carb and it still hesitated, sputtered. Turned out to be the ignition points. So don't count out weak or worn ignition parts.

[geraldchainsaw]

to bot,  rm57 an mustang6984,   the gas is probly old,,  an right a trip down the hwy might help,  the distributer is petronic   

[mustang6984]

I'd run it until the tank is about 1/2 empty...maybe more...then fill it and come on home. Try the lights again and see if that improved.
IF that doesn't do it...might be the ignition. Buddy of mine has the same as you...and his was bad...causing him to have issues once it warmed up. New unit...runs like a Swiss watch, Technology...its great...until it isn't.

[geraldchainsaw]

to mustang6984,         whats the lites have to do with it?,    an your friends new unit,  what would that be?,  thanks for the help,   jerry

[mustang6984]

to mustang6984,         whats the lites have to do with it?,    an your friends new unit,  what would that be?,  thanks for the help,   jerry

Sorry...shorthand speak doesn't work well in forum speak! LOL!!!
I meant to try driving through the lights again...see if it does okay after that freeway road trip...if it eliminates the issues you currently have at stoplights.
I am not sure what he bought. I will ring his chimes tomorrow and ask what e had and what he has now. Let you know tomorrow.  (His ride is a '64 T-Bird with the FE engine and C-6)

[cos]

Hello  If weather is hot, probably vapor lock. Pat F in Texas has good advice on vapor lock, if thats the problem.

[geraldchainsaw]

I've had the mustang for 30 yrs,  never had a problem with vapor lock.    I've gotten old,  maybe its time to sell

[mustang6984]

I've had the mustang for 30 yrs,  never had a problem with vapor lock.    I've gotten old,  maybe its time to sell

Nope...not time to sell.
So...apparently after several electronic ignition systems he did what I had suggested...went back to points/rotor/condenser and has had no issues since.
I know there is testing equipment out there to check those modules but I do not know if there is a home mechanic version.
My knowledge on those things is very limited other than they are great...until they are not. A shop could probably check out the module, or maybe Gary would know something about them. But what you are experiencing sounds a lot like what my buddy was dealing with. I'd try the freeway cruise, and if that doesn't fix it...then shop time perhaps.
Sorry not more help.

[abe_lugo]

Try a different condensor. 

[geraldchainsaw]

to abe lugo,   I'll give it a ck,  thanks                 ok,   what condenser?,   I don't have [points,  I put a Petronic system in

[KULTULZ]

... the distributer is petronic

Do you have a complete PERTRONIX DIST or just a MODULE in a FORD DIST?

[geraldchainsaw]

ok,  to KULTULZ,    ITS JUST THE ADD ON SYSTEM,  MODULE IN A FORD  DIST

[KULTULZ]

Is it the original 1957 FYB DIST?

You did a conversion? IGN I or IGN II? Used what coil?

Remember, the module only gives a hotter spark, mechanical and vacuum advance are still mechanical.

https://pertronixbrands.com/pages/ignitor-12v-troubleshooting

CARB type? Fuel pressure good?

Wait a minute ... I can't seem to be able to read ...

It is a 1969 MUST?

Different story,

What engine and trans?

It runs fine until you let off the fuel at a stop? Does it still have the IMCO two signal advance on the DIST ADV? Have you removed all the EMISSION FEATURES?