Thread: 428 stumbles/misses after warmed up ?????
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Old 02-25-2009, 07:31 AM
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Cobra Make, Engine: Mid-States, 428 Police Interceptor, TKO 5 speed, Jaguar rearend, Trigos, and Guardsman Blue!!!
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Default 428 stumbles/misses after warmed up ?????
Hey,

I now have about 350 miles on the 428. You can go 10 miles get some heat in it and it runs great, turn the car off and let it sit for 15 minutes. It starts right up, you go 5 more miles and then it starts to stumble when lightly going through the gears or cruising at 25 to 35 mph. Then it will be fine for a mile or two then it will randomly start stumbling again. Not fun.

Changed the plugs, new 8mm wires. Timed it with 12 at crank, 36 total. Fine
tuned the mixture screws (3/4 turn out). Pertronix II in the distributor with their epoxy filled coil. No MSD box. 750 Holley DP with milled air horn. Carter
steet-strip fuel pump.

So what do you think ?? Fuel or ignition ??

Thanks,
BC
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