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Here's a couple Ideas to try.

1. Make sure you are getting full throttle travel with the pedal pushed
 to the floor. Not likely the problem, but a good thing to check.
 The reason for checking is because Ron Wester ( screaming Yellow D)
 had an Acceleration problem. WE discovered with the pedal to the
 floor he was only getting Half throttle at the engine. I discovered the
 pedal arm was bent towards the floor which limited travel. It was easy
 to bend it back to normal. 

2. It could be possible your Ignition Is breaking down at RPM.  Or the
 Advance is not working. You a Mechanical and Vacuum advance here.
( Low Probability)

3. Sever idle hunt is probably a vacuum leak. Does it ever settle down?
 Check W pipe gaskets and idle air tube O-ring in the bottom of the
 Airflow meter.  

4. Since your successful REDLINE RPM test was without the air cleaner
 on Check to see if the air box is unrestricted.  Although an air leak 
down stream of the airflow plate would cause a very LEAN situation. 
(low power and back firing). A restricted Air filter would cause low
 power RICH condition. But, I would also expect to see a some what 
sooty exhaust.

Good luck


--- In dmcnews@xxxxxxxxxxxxxxx, mike clemens <rmclemns@...> wrote:
> Okay, some history first, since several folks have asked.  Josh's car was originally sold in 
New York and was driven there for many years.  Then it made it's way to California and 
then to Oklahoma and now it resides in Arkansas.  My best guess is that before I started 
working on it, it has probably been 10+ years since it last ran under it's own power.
> Here's where we are today.  I utilized many of the ideas that the List provided to try to 
solve the backfiring and bogging between 3 and 4000 rpm, but one hit the nail on the 
head.  Thanks to Ken K, he suggested I push down on the air metering flap, while at the 
same time, giving it throttle.  RPM's went all the way to red line-----yea.  He also gave 
me two things to look at----a vacuum leak and possibly the cat plugged.
> Well, when I snapped off the O2 sensor, I decided to go ahead and pull the cat, since I 
was already there.  I was able to remove the cat and when I looked inside, I saw a mud 
dauber nest!  After about 5 seconds of trying to figure how they got in there, I came to 
realize that it really wasn't a mud dauber nest at all, but the cat had overheated and 
melted the 'guts'.  Since the cat was useless, I gutted it and reattached everything, 
including a straight pipe in place of the muffler, just to see if this fixed my problem.
> Answer----nope.  I still can't get full throttle and now the idle is hunting both cold and 
hot.  (550-950 rpm)
> I'm down to this last thing to get BB running 4.0 and out of my shed.  Any ideas will be 
greatly appreciated.
> Mike   TPS   1630


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