the miss from hell

[austang427]

Ive been fighting an off idle miss for months now, the car runs great full throttle and idles great but when just cruisen it cuts in and out terrible, Ive changed every ignition part or tried another one,the fuel stays steady through all RPM, ive checked every ground, compression was good,readjusted the valves, checked for vacume leaks, im about out of ideas, I even took it back to the dyno shop and they said all the electrics looked right and it even made the same power on the dyno,and it throws no codes.it started after racing at the track. heres the motor stats
427w
stock distributor
77mm pro m mass air
75mm TB
Victor EFI
42lbs injectors
Dispite the miss ive put quite afew miles on the car and it hasnt got better or worse.
Just looken for new ideas?

 

[Fox8950]

Does it start cutting out right away when you get to cruising speed or does it cruise fine for a few minutes then start cutting out? ... if its the latter than maybe the TFI is acting up when it gets hot? just shootin in the dark here.

 

[rd]

The last time I had this, it turned out to be a sparkplug with a crack in the ceramic insulator. Took me a couple weeks to find it.

Next up would be plug wires, then something like a rusted plug wire terminal, such as I discovered Saturday...

A piece of dirt in the main jet of a new Holley was the time before that, but you should not have that.

 

[austang427]

It starts to miss as soon as you get moving,Im on my second set of wires and plugs,and I tried a new tfi. Is their any way the tranny could be messin with the computer? I know my convertor is not up to the HP the motors makin.