help car is sputtering bad!!!!

[wardog]

this sputtering or misfiring happens at above 4k rpm till redline what can cause this ??? any help would be appreciated thanks:1zhelp:
List of mods is on the dyno sticky

 

[AF1JZ]

I'd say plug wires possibly.

 

[starscream5000]

Lack of 550 cc injectors with that lex afm?

 

[mkIIIman089]

I doubt it, he's got more then enough fuel since I see he has a FPR and a walbro; as long as he bumped the FP a little bit. Unless of course something broke/died.

Anyway, any error codes? Is this at 1 bar or 11 psi? WOT is the only time this shows up? When was the last time you changed/checked spark plugs?

 

[SupraDread]

Check your timing. Did i say check your timing?

 

[wardog]

i have the iridium ix and have had them for year and ahalf the ngk wires i have 2 1/2 years with and the boots on most of them are not in tact with the wire ....

 

[wardog]

I just got home from work ill check the timing tomorrow i gotta go buy a timing light .....when i dynoed the car the guy tuning it did not move the fuel pressure he said he didnt have to with the safc2 it is set at 30 with vac on ...

 

[SupraDread]

i have the iridium ix and have had them for year and ahalf the ngk wires i have 2 1/2 years with and the boots on most of them are not in tact with the wire ....

If the wires are seperated from the boots then replace those first. If problem persist then i would check my timing.:icon_bigg