Help car drops 700 rpm when going from neutral to first gear

[ollucky]

Originally Posted by HandOverFist

There is the key. What has been done/changed since the last time it ran properly? You stated this is a new combination...did you by any chance add/change any timing related or ignition components?

Just engine combo long block? Went from a 355 to a 406. Same Heads Intake and Carb for the last 15 years.

[HandOverFist]

Originally Posted by ollucky

Just engine combo long block? Went from a 355 to a 406. Same Heads Intake and Carb for the last 15 years.

My point was carb's don't just go bad/quit working overnight. Unless it has sit idle for a very long time with old fuel I would tend to look elsewhere first. Someone suggested earlier trying another carb for effect...way less time consuming and a quick way to eliminate one potential area.