My GTX

[Big Boy]

Hi. I have a 1969 GTX 440hp When driving 30-to50 mp the car sirging up and down like its straving for fuel does any one no what this is from.

 

[tak419]

Sounds like a fuel issue, could be running lean. Fuel pump, filter, carb running lean all could cause that.

 

[Bob Sawyer]

Fuel pump push rod...

 

[NOSTRT980]

vacuum leak. maybe

 

[Curiousyellow71]

Are you running points yet or is it converted to electronic ignition? What does it do after 50...smooth out or quit entirely?

 

[OKDart]

If it just does it at cruise, and not during accel/decel, try adjusting the vacuum advance

 

[Dan L]

Float height correct? Fuel line to close to exhaust heat?