need some advice,

[geraldchainsaw]

ok to KULTULZ,    its orig ford dist,  been years since I installed the Pertronix,  all I can say is it was off shelf,  so i don't know if it was 1 or 2,   carb type 650 double pumper,  never cked the presure   I'm sure the problem is a simple one,  I'm just not good enough to find it.   like I said,  it idels fine,  going  down HWY no ;problem  only when I come up on a red lite. acts like it wants to stall

[KULTULZ]

... idels fine,  going  down HWY no ;problem  only when I come up on a red lite. acts like it wants to stall

So the only time it does this sis while letting off the fuel for a stop?

Is it AT or ST?

You need to check DIST ADV and fuel pressure. The CARB is adjusted correctly?

[djfordmanjack]

asfaik these years started with quite complex emission control systems. check all the vaccuum lines and hoses !
if it's AT, also check the vaccuum unit on the trans.

[geraldchainsaw]

first,  thanks for all info given.   I think its time to take it back in to the shop.    off hand I don't know what AT or ST is,      the vacumn lines would seem to be alright since idle is ok,   an since I have no rack to look underneth it'll have to go in to ck trans.   is AT automatic trans?,  ST stick?   thanks again     jerry                                        I might add its a FMX trans,   the idea of vacumn unit on trans is a good possiblity,  its  raining here today,  so I'll ck the auto manuals.   I might add,  being 88 I can't do the things I use to,  all I can do is ask questions or have someone do my work.     jerry

[geraldchainsaw]

ok,  it was brought up it could be the vacumn mod on the trANS, ANY ONE KNOW WHAT IT DOES?    JERRY

[KULTULZ]

ok,  it was brought up it could be the vacumn mod on the trANS, ANY ONE KNOW WHAT IT DOES?    JERRY

That will be the modulator valve. It controls shifting.

It or the vacuum supply line can go bad.

AT = AUTO
ST = STD

If yours is an AT, is there a dash-pot on the carb linkage?

What engine and is FMX?

[geraldchainsaw]

no dash pod on carb,   351w   with FMX trans,  was hopeing it was the vacumn mod on trans,  now not sure

[KULTULZ]

The purpose of a dash pot (or vacuum/electric solenoid/throttle kicker) is to lessen the drag on the engine from the torque convertor while coming to a stop.

HOLLEY does offer one.

It is difficult to diagnose a problem over he net without specific build info/photos.

[geraldchainsaw]

into the shop it goes, thanks for all of the help,   jerry

[KULTULZ]

Let's us know what they find ...

[geraldchainsaw]

ok,  update.    let me tell the whole story before you say anything.   I had to help the mech,  press on brake put in drive,  he sprayed all around eng,  1 spot the eng smooth out,  turns out the front of eng intake manafold has a leak, the cork gasket an silicone leaks. ,   now the correct fix is to take the manifold off an redue it,  but,  since its going to cost  a arm an ;leg,  we come up with a cheaper way of doing it,  may work an may not,  if not then the hard way.   hes going to take the dist off,  clean up around gasket area, silicone the area, , might do it an then maybe not,  we'll have to see.    an thats whats happening.   any thoughts?    jerry

[mustang6984]

Short term...might work. But long term...gonna need to pull it and do it correctly. Shouldn't be all that expensive to just R&R the intake and new gasket for it. Less than a day's work...maybe 4 hours worth.
Good luck.

[geraldchainsaw]

I'm 88,  how old are you?     didn't m,ean to sound sarcastic,   ,   I just have a harder time doing things any more

[abe_lugo]

I thought you went back to points.  Nevermind. 

[mustang6984]

I'm 88,  how old are you?     didn't m,ean to sound sarcastic,   ,   I just have a harder time doing things any more

Understand...I am just a youngster compared to you...only 73. LOL!!! If we were closer I'd pop over and do it with you. But I am in Branson MO area.