joesal68

I have a 98 trans-am mostly stock except a few bolt-ons, TSP Longtube Headers, Y Pipe exhaust. Also Performabuilt Level 2 trans with 3200 stall.

I am getting 3 codes P0131, P0151, P0300, I have done the following, Replaced MAF as the old one was ported, Replaced the o2 sensors with Bosch sensors, New wires and plugs, Also rerouted the PCV lines with new hose and an in line PCV Valve, Fuel Pressure is at 63psi

I have already had the car mail order tuned by frost after the long tube header install. I have cleared the codes and even pulled the PCM fuse and disconnect and reconnect the battery. The codes still come back

When i am accelerating when the engine is cold i can feel a hesitation before it shifts...Any ideas will be appreciated...

2xLS1

iTrader: (25)

Those codes indicate running lean. Your O2 sensors are either staying below 200mv in closed loop or 360mv in PE mode. What ever the problem is it is going to be something that is common to both banks. Does the code usually set when normal cruise driving or when WOT? What is the fuel pressure at WOT? Always a possibility of a typo error in the tune too.

http://www.gearchatter.com/viewtopic8755.php

http://www.gearchatter.com/viewtopic8746.php

joesal68

The code shown when just running normal, I will have to check fuel pressure at WOT

LSX Power Tuning

iTrader: (4)

Are you running O2 extensions? Did you have the codes before the tune or did they just pop up?

joesal68

yes, i am running extensions for the long tube headers