09-10-2003, 11:36 AM
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Mustang Maniac
Join Date: Sep 2000
Location: GA, U.S.A
Posts: 2,266
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Stumbling over 4000
Let's say I'm racing someone and through just about every gear (but not always), when it gets above 4000rpm, the engine starts stumbling. You can see the tach needle jumping, as if something's missing. I've changed and/or checked vacuum hoses, fuel filter, spark plugs, plug wires, and TPS (and cleaned out TB with STP fuel injection TB cleaner) and all of those are fine. Any other ideas as to why the car does this? Every once in a while, it surprises me and pulls through the gears fine without any stumbling, but most of the time you can count on it.
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351W-powered 1979 Ford Mustang Ghia notchback
'79 Video @ Idle
Stock 5.8L under 4" cowl 'glass hood, C4 w/ Transgo shift kit, Holley 750 cfm, Edelbrock Performer RPM intake; Fluidyne Al radiator, Flexalite 175 electric fan, 1 5/8" MAC shorty headers, FRPP Al driveshaft; S&W 6-point cage; 2.5" Off road H-pipe, 2-chamber Flowmasters, 8.8" Rear w/ 3.55s; Weld wheels (15x6;15x8), Front: 225/60/15, Rear: 275/50/15 Nitto NT 555R Drag Radials;
14 x 4” K&N X-stream air filter.
'92 GT (5-speed)
Small In Car Video
Stock 5.0L, 2-chamber Flowmasters, MAC CAI, Tri-Ax, Al pedals...
"Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body
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