[Spridgets] Running rough

[Robert Weeks]

Hi All,

I finally got my Midget started but am having a hard time getting it 
running right. I can get the car to idle pretty smoothly around 1000 
rpm. Below that it starts getting rough. The biggest problem I'm running 
into is when I've taken it on test runs up the street. The car sputters 
and looses power above 3000 rpm. Letting off the gas for a few moments 
will clear things up but then as soon as the gas pedal is pressed it 
stumbles and looses power again. Almost sounds like it is backfiring but 
I have a cherry bomb on the car so it's hard to tell.

The car is a 1970 MG. New aftermarket electronic gas pump. New 
distributor with Crane electronic ignition. New sparkplugs properly 
gapped. I'm using Frank's "set it where it runs best" method for the 
distributor timing and was trying to use the John Twist method (see 
youtube for University motors videos) for adjusting the carbs (SUs).

Any ideas on getting this running better would be appreciated. 
Accelerating from idle in the driveway is smooth, but accelerating under 
load is pretty horrible.

Thanks,

Robert