Hesitation/sputtering at WOT from 3-4k rpms

[N8Miller]

Last spring i had the MAF rebuild by the new pro-m company. Yesterday on the way to get it inspected, i floored it. to my surprise, the car was spitting and sputtering from 3-4k, but after that, it cleared up and seemed to pull out of it.
I know this is kinda vague, but can anyone shed some light on how the computer/o2s/MAF stuff work.

thanks

 

[Grn92LX]

Sounds like a lean issue. Get the wideband in and lets see whats going on. Is the PMS in yet?

Sometimes with LT headers the o2's cool off and won't read (they'll be 0 on the PMS screen if they're not working right, so you'll see) and when they don't read correctly, the engine leans out in part throttle.

 

[mondos90lx]

im getting the same prob, so until i put on trick flow heads im swapping back down to 19lb injectors, upgrading my fuel pump (since it died) putting in new o2 sensors, a new TPS sensor, and since i have a FPR im just gonna up that

 

[HISSIN50]

It sounds like he was at WOT when the stuttering occurred (no lambda input AFAIK). I like the meter idea though.

 

[Rick 91GT]

Nate did you ever put the new O2's in, they were pretty scary I'll be around today...

 

[NoSloCoupes]

Did you lengthen any wires to the meter when installing the PP? If so, check for a loose connection. I had this exact same problem which turned out to be a loose wire. Def. sounds meter related.

 

[N8Miller]

Did you lengthen any wires to the meter when installing the PP? If so, check for a loose connection. I had this exact same problem which turned out to be a loose wire. Def. sounds meter related.

i didnt lengthen any wires, but some of the wires got hot in the engine bay with the red tubing around them, it think from the headers (or getting too close to them). They look somewhat OK, but i think that ill cut, splice, solder them and make sure they the wires are good!

 

[TC93]

Do you have the air filter, hooked on the MAF?? If so put the stock air box back on or move the filter..