Troubleshooting stumble at idle in gear

[rich006]

I know this is really simple but what are your idle RPMs in and out of gear?

It drops maybe 180-200 RPM, so say 750 and 550-570.

 

[str12-340]

I'd start by raising the unloaded idle to 1000 rpm, isn't the stock spec 1200?

 

[Dartswinger70]

why would it be 1200 because of the load when put into drive on the auto trans? does it drop down to 850-900 when in drive?

 

[str12-340]

So I bothered to look it up and the spec for a later 225 (based on OP's avatar) calls for 750. But then this isn't a stock set up. For comparison the spec for a 1970 318 is 700, but for a 340 it's 900.

I'm also curious if you (OP) are using gas with ethanol and if so are you using an additive to protect your carb and tank?

 

[rich006]

I set the idle at 750 (in Park) per the 1974 fender sticker. I realize that might not be optimal in the current build, with modern fuel etc, but I don't know of any reason to change it. Anyway, it's been running well for the last couple of weeks. There's still a slight hiccup when it's idling in gear, and I plan to continue troubleshooting that (had to buy a new timing light when my old one quit lighting up). But it's not stalling at all.

 

[Inertia]

Don't suppose you looked down the carb for that pesky drip I mentioned ?

 

[rich006]

Don't suppose you looked down the carb for that pesky drip I mentioned ?

Actually yes. I didn't see anything.