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runs fine for 10 minutes. then falls on its face and backfires, looses most of its power . let off the accelerator and it idles fine. have repaced fuel filter, pressure regulator, dist. cap and rotor, coil, emptied gas tank and cleaned thoroughly. added new fuel and half bottle of lucas. seem to...

runs fine at idle and first 10 minutes. the runs rough back fires and looses power. but will idle fine. replaced fuel filter and pressure regulator. now testing for faulty fuel pump. need to know psi at fuel rail at idle and while driving.