Misfiring?

[Coupe427]

I'm not real sure how to explain this but here goes. Went out to test a new prop and at one point in the ride the motor didn't feel right when I hit the gas. Doesn't do it all the time just a here and there random kind of thing and feels down on power. After watching the video I recorded it was caught on camera. Skip to about 2:40 to hear the flutter.


http://youtu.be/kAe2H2AHNWM

[outasite]

Carb or efi? Sounds like you can hear coming down as well.Maybe a broke off tuner rattling around in the can? Coil breaking down?

[Dave Strong]

What rpm does it start at?

Dave

[Coupe427]

225 EFI. That would've been around 5k rpms.

It didn't do it the whole time I was out though.

[CharlieB53]

Would like to have seen the tach to know what RPM was at each portion of that run. It never seemed that it was turning anywhere near WOT RPM.

How old are the spark plugs and what do they look like?

[Coupe427]

I was running a 28 drag 4 between 55-70 mph on that stretch so it would've been 4000-5500 rpm range. Motor was built this spring so its not that old. Will have to pull the plugs to look at them.