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My wife's 73 XR-7 has the 351C 2v. I took it out on Saturday; but noticed that on flat ground it would stumble as if it were not getting enough fuel. I ran it back home and found a fairly dirty fuel filter. I cleaned it out- no spare handy; but it made virtually no difference. I will pick up a new fuel filter and try that next.

IF there is no change what else can I look at?
 

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Distributor vacuum line unhooked, rotten, broken, cut, or kinked? Distributor vacuum advance diaphragm ruptured? Distributor advance plate stuck? Distributor centrifugal advance stuck?
 

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And/or the the accel pump (squirter) on the carb is shot or the circuitry in the carb is plugged up and needs a good cleaning, choke not functioning correctly, timing not set to best place....
 
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