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Well must of stumped everyone

Not having a cat will not cause your truck to have a intermittent miss. As well as the second o2 sensor. All it does it make sure the cat is working properly. Unless u need it thereto pass inspection. I wouldnt waste any money in getting one out in. But that's me. Sounds like a vacuum leak. On...

It gets worse until a certain point. I don't know where in the rpm range it clears up, but it clears up

I was thinking same think as well. But why would it clear up after it gets into higher rpms?

1997. My old votech teacher said according to his tech program, it's a fuel related issue. Hence why I checked fuel pressure

Iac? What is it and where is it located?

So I've been messing with this since day one. I've had for 2 months now and can't figure it out. I have cleaned maf changed coil packs plugs wires. I've taken fuel pressure at rail came out with 30 psi running. Down to what's wrong. Happens in every gear except first. But at lower rpms I and...