sputters bad

1972 FORD F-100
86 MILES
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ROSSCOG
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My ford 390 with a holley 500cfm sputters badley when under a load and acceleration. but idles fine. any ideas changed accelerator pump. messed with timing advanced to retarded no help,
Jul 26, 2012 at 2:52 AM
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JACOBANDNICKOLAS
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Check to make sure the accelerator pump is working properly. Make sure there are no vacuum leaks, make sure the fuel pump is supplying enough fuel.
Jul 26, 2012 at 3:55 AM