Perhaps I replace them and simply forgot Am I mistaken that O2 sensors do not affect the engine until warmed up and in closed loop? If so, then they have nothing to do with the bucking and back firing, correct?

 

All your issues are within your tune. You really need to buy a Wideband 02 sensor as stated above, it will tell you what is comming outta that motor, and will allow you to monitor it accordingly

 

Anyone have EFI Live, v1 or v2, that they'd want to sell? I'm definately in the market.

 

So now you not only want me to buy EFI Live, but you want to further drain my bank account and buy a wideband O2

 

Ive had better luck with bosch, they toggle better and last longer, they have a spherical end instead of a cylindrical end.

 

A wideband should be standard equipment with any tuning software

 

Which one then

 

Innovate LC1, its got a digital output so its better. You can get it from Kbracing96, I got my EFI and wideband from him. Good guy to deal with.

 

Yes, he was very prompt with his PMs last night.

 

I just put a fuel pressure guage on it. It was reading 50 PSI at idle. This is on a cheapy Autozone guage. I swapped in the pressure regulator from my 5.3, and it's now 54 PSI at idle, and about 52 with a few RPMs. Is it normal for it to fall for a split second when you blip the throttle? Also, the needle "quivers". I'm assuming this is normal?

Probably time to change the fuel filter if nothing else. It's been a while.