shaun99z28

Just put some LT headers on my 99 z28 6 speed car with a 3 inch cat less wye pipe. I do not have a tune on the car yet but I will be getting on next week. The car us missing between 4000 and 6000 rpms at WOT. I want to make sure that I don't have another problem before taking it to the tuner. Thanks for any Input..

Paul Bell

iTrader: (9)

A tune should fix all that.

Did you change the spark plugs?

shaun99z28

Yes changed the plugs when I installed the headers. Put a ngk tr55 gapped @ .050

Majestic9C1

iTrader: (19)

probably caused by the rear o2's not tuned out yet..

Paul Bell

iTrader: (9)

The rear O2 sensors only gauge the efficiency of the catalytic converters. They have no bearing on how the PCM controls the engine-which is why they can be tuned out.

CoolAid

Check for a cracked spark plug with misfire checks on a scanner.

LS1 Fbod plugs are a bitch to service. I cracked the #8 taking it out when I did LTs. You might have cracked one putting em in.

ds98formula

iTrader: (3)

Also check that none of your wires are touching or are too close to the headers. The can get burned and start arching.

Full-Force

iTrader: (11)

I bet its a cracked plug, loose plug wire, or make sure your o2 sensor wires are not touching a header tube and burned up. Check the "ENG" fuse under the hood also

1_MEANZ28

iTrader: (4)

Go over the spark plugs and wires again.that and or the tune will fix your issue.