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i just got a 79 elcamno 305/4 bbl. holly. it has a bad hesitation when i step on gas. so far they have replaced plugs /wires/dist. router. and full filter.and rebuilt the carb. and still does the same.any ideas what to do next thank you for any help i can get.just wasting money so far.
 

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Too much (cfm) carb? It happens all the time....Bigger is not better. Air fuel balance is better. So what is the size of the F**d part...I mean Holley carb you have on there? A 305 don't need much.

:beer:
 

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It's not a waste of money or time, other than you perhaps weren't prepared to do a full on tune-up to your Hot-Rod at this point in time; however, if you did all that, you must have needed it done. So don't kick yourself just yet; once you find 'it', you're going to have such a good running ride for a long time to come!
Yep, have you done the 'all over vaccum line test' or know how to do a quicky on that? How old is the Fuel Pump. It might be time for you to do an oohm test on your seperate spark plug wires, including your coil wire. Does the hesitation change from when the engine is cold or when it's been idling up warm? How about when it's under a load, such as with going up a hill or a couple friends inside or a stack of blocks in back? Has it only been with this tank of fuel? A certain RPM range is worse than others? Most importantly; what did the old plugs look like for each cylinder? Let's start with these and work out. Usually the culprit is a vaccum leak 93% of the time though.... Nitro Good luck!!!!
 

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I had that problem with my 454, it turned that it need bigger squirters for the accelerator pump. And I also had the wrong plugs in the engine, and I had to adjust the linkage on the pump. Works good now.
 

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welcome Will. :texas:
what kind of holley??
check the accelerator pump.
usually with a holley its an adjustment/tunning problem or pump or vacuum leak or x2, too much carb..
usually when the diaphram goes in a holley it will leak all over the intake,,youll know..
oh yea holleys are for race cars..:poke:
 

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I had that problem with my 454, it turned that it need bigger squirters for the accelerator pump. And I also had the wrong plugs in the engine, and I had to adjust the linkage on the pump. Works good now.
^ Bingo

This is most likely being caused by a lean condition. When you floor the accelerator, there is not enough gas going into your engine and its falling on it's face.
 
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