I have a 1965 chevy c20 with an inline 6. I have just bought it and only driven it twice, about 30 miles on both trips.It was running like a champ, real strong. Yesterday on my second trip it drove fine the first 15 miles to my sisters house, then when i went to leave i got a few feet down the road and it just choked out.
What it's doing:
It idles perfectly, and when normal gas is applied through the pedal it revs fine. However, if you press the pedal or the throttle arm quick to the floor it sounds like it is sucking air and after doing this 3 to 4 times consecutivly it backfires loudly. I would also like to mention that the choke and its compents are confusing at best and do not look stock, but they worked fine the first 45 miles.
When its driving:
It seems to run ok, not as good as the first 45 miles, in first and second gear but when i shift to 3rd it does not respond to the gas pedal and if its getting a load like an uphill it will eventual shut the truck off. I checked the timing and distrubutor, it checked out good.
