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Discussion Starter #1 (Edited)
So as stated I'm loosing rpm and power on the big end intermitiinly. If I'm in it all of a sudden ill feel a loose of power for a second or two and then it comes back to life. It's not dieing but just loosing enough to feel. Any ideas? This is a 500 inch ford with a dominator turning 6300 rpm
 

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Fuel system, check/change filters, confirm wfo fuel pressure at the carb, make sure the pickup in the tank is in tact.

Plug wires, check out the distributor cap
 

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I had a kill switch breaking down that caused that. Took me forever to find it
 

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Put a fuel pressure gauge where you can see it at wide open.
It could be any of several things, but inadequate fuel pressure will do exactly what your talking about.
 

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has it ran before correctly with this tune to confirm it is a failure of some sort? electric fuel pump getting weak,, too lean of any sort, (detonating from lean) , not enough octane or too much timing?plug fouling,wire misfiring ?
 
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