Been having some backfire issues on the freeway and a loss of power when shifting into third at wot I'm thinking the quadrajet is running out of fuel. Then I noticed my filter (relatively new about 6 Mos). Is barely filling at idle. Even when I increase rpm the filter never completely fills. Is this normal or signs I need to replace my fuel pump? If so what kind is reccomended. It's a 400 engine with a pretty nice size cam and a smi built quadrajet. I did notice the loss of power after 3 and the back firing more apparent after I changed my hei curve to come all in at about 2800 rpm and my timing set at 36° all in. If the amount of gas is fine should I just fatten up the a/f screws on the carb? I have them adjusted with the vaccum gauge getting about 10hg at idle
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