ok so i start the car and immediately have to give it gas to keep it going and engine will absolutely not idle. dies indefinitely. especially strange is when i have my foot on the pedal to keep the engine running the rpms gradually go down unless i give it more gas. car did not have this issue driving at first (test runs around the block) also when this problem first appeared the engine would barely start back up after stalling. carb ran fine on a 307 last summer and in the test runs on the 350 and i have not adjusted it since. any help at all would be greatly appreciated.