The Question was asked in another thread, How do I find vacuum leaks?



I usually use Berrymans B12 (Smells Better) With the little red plastic hose

attached.



remove air cleaner assy.



Start engine.



Using light pressure, spray very small amounts really close to suspected area.



Look for a change in rpm.



If you lean out the carb until it runs lumpy, then spray the chemtool, you will see

and hear the RPM jump up and smooth out.



Feel free to add as you see fit!

the other good way to do it, is to put a plug (i usually hose clamp a rubber glove) over the intake, pull off a vacuum line and blow. it works well to find small leaks



mike

Thanks Mike & SmogFighter;

I talked to RB for about an hour Friday and they finaly agreed that there setup is probably screwed up. So now I have to send the Crab back to them, and wait another 2-3 weeks for a new one. It took 6 long distance calls and no one with any answers except for what I already new. Oh well another one for the books.

The thing that pisses me off is that this 84-GSL is a screamer and kicks ass except for the stumble. https://www.nopistons.com/forums/pub...O_DIR#>/11.gif

You would think that for $800.00us that they would pre-check these carbs before they send them out.

Thanks for Youins Help

Steve

haha, i thought they did pre check em?



mike

Don't blame RB too much.

I talked to a engine builder this morning, and his usual procedure with HOLLEY carbs

is to install the first one, look at the second and return it, then install the third, then

the fourth or fifth one will idle and run.

Then he starts to tune.



they (HOLLEY) just throw them together, then box & ship.

I've only had this problem once out of the 30 or so carburetors I've rebuilt/replaced.