Gentlemen: I have a recently acquired 69 Chevelle with a 250 cu. in. six. The more I drive it, the better it runs. However, I have recently experience a nasty bog or hesistation or stall out problem. Once in 25 miles it will have this major stall out, like it hit a brick wall for 1/2 a second ( sorry for the exaggeration, but it's not subtle ) and usually the car drives right through it. In the past 3 days, however, the car has actually stalled out while driving at low speed. The good news is that I can restart it, with difficulty. I am aware of the concept that gas, air and electricity being present, an engine should run. I am not sure where to start. A couple of knowledgeable people have said ( sight unseen ) do a carb rebuild, the problem is probably an accelerator pump. In your opinion, what is my best way to proceed to correct this unacceptable problem. I am grateful for any and all advice. Thanks in advance. R.B.

Oops, I forgot to mention, Rochester Monojet (Made in USA), 7029014 143 9 BB. Is it just "due" or what? Don't know the history of the car. R. B.

check the fuel filter. I had a problem with my first quadrajet. There was no filter in the carb so every little piece of junk out of the tank flooded the motor.

Probably the cheapest fix to start with.