350 hesitation & RPM drop

[Elpresidente]

I've got a 350/700R that ran fine yesterday, but today it has a slight hesitation when accelerating from idle, and my engine speed drops almost to the point of stalling when I let off the gas and brake (ex., it does this when I have to brake hard for a red light or when braking to make a turn). Letting off the gas and not braking is fine, but gives me the hesitation when I do accelerate again. It cruises fine, and performs as it should when I step on it. Fuel filters clean, and couldnt find any vac leaks.

[zieg85]

Take off the vacuum line to the power brake booster and plug it.  Note no power brakes will be like stepping on a brick but it will stop, just take a lot of pressure.  Sounds to me it is the start of a bad brake booster

[Irish_Alley]

Take off the vacuum line to the power brake booster and plug it.  Note no power brakes will be like stepping on a brick but it will stop, just take a lot of pressure.  Sounds to me it is the start of a bad brake booster

x2

[Elpresidente]

I never would have guessed that. Tightened the carb bolts, that helped a bit. I'll give the booster a look, thanks.

[Irish_Alley]

Can you hear it hiss when you press the brakes