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hello i am 15 and working on a 1966 c30 that i bought for a 1000. i am having trouble with the 292 straight 6 when ever i give it any more than a little throttle in drops rpms like it wants to die then back fires out of the carb i have replaced the fuel filter because i think it was leaning out but it still does it. this will be my first truck.
 

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Welcome to the forum...glad to have you here sign0016 , so rpm`s drop when you press the throttle, first thing to look at would be vacuum advance and or mechanical advance, first locate the rubber vacuum hose that runs from your carb to the distributor, ( hopefully its there anim_63, if not this may be your problem altogether) disconnect the end at the carb, now suck on it, if there is no resistance then you`ll need to replace the vacuum dashpot. I will give you time to try this first....! Here`s an image for you what you are looking and checking on on the side of your distributor...
 
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