Hey guys, I could really use some help diagnosing a troublsome vacuum leak ( i think). Here is what's going on:
I have completed installing and tuning a new holley v4 street avenger. After tuning correctly and having my timing checked as well it was running great both cranking and running. However within 4-6 hours i noticed some really bad hesitation, even to the point it would almost choke itself out on take-off and I assumed a vacuum leak. After replacing a plug that looked a little bad, it again ran good. Now a day later same problem again. I replaced fuel lines, fuel filter, PCV line and fittings, and have checked with starter fluid for leaks and can't find any. Please advise I'm at a loss for the possible cause.

The only other thing i have noticed is, I have a spall 3/4 in. plate in between my intake manifold and my carb currently which had the plug that i was having all the problems with capping. Could this plate be the cause of the leak? It's a 20 dollar fix which i'm going to do tomorrow, i just hate that i can't drive this weekend and can't seem to figure this out. Any help would be greatly appriciated, thanks

 

make sure the gaskets between the plate and carb.,and the gasket between plate and intake is sealed good vacum leak could be there. make sure the floats are set correctly. is it eletric choke if so make sure it will open all the way when hot.
good luck

 

Not the choke it's working fine, and it could possibly the seal there i'm not sure, thats the fix plan tomorrow unless someone has some advice

 

bump

 

Please anyone, a little help please...I just finished replacing that spacer and what i thought was the source of the leak. In fact i found a small leak due to corrosion on the fitting...but still same problem! I have checked everything i know to someone please help