billbixby23

I did an LS swap on my 86 C10. The rear O2s were removed and using the font ones. I had the ecu tuned to zero out the MAF sensor, everythings is stock in this 01 5.3 ls motor but the O2 sensors foul out all my plugs. I have used two sets of Bocsh O2s usng the NGK TR5 plugs now i have some densos that I am going home to try with a new set of plugs but if this doesnt work any other ideas. I am at the point of not running O2 sensors but I dont know if it will kill my gas mileage tremedously.

1320

iTrader: (6)

I dont understand "zero out maf" Is it speed density now? Is the maf still on? Sounds like a tune problem so far.