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Have you checked your timing with a light?.....Don't get stuck on the idea that it's running lean. It could be a by product of something else wrong. It's not physically running that lean, the ECM is adding alot of fuel to compensate for something.......For some reason the ECM is also keeping the idle high, probably because it just won't run lower. Is it possible you have some mechanical issue? Did you rule out EGR? Double check everything distributor related. Reluctor phasing and gap. Make sure the low voltage wires are correct....How's the coil? Could you swap out with the 4.3 coil?......I still don't know what's wrong with your truck. Just giving ideas.......
Have you checked your timing with a light?.....Don't get stuck on the idea that it's running lean. It could be a by product of something else wrong. It's not physically running that lean, the ECM is adding alot of fuel to compensate for something.......For some reason the ECM is also keeping the idle high, probably because it just won't run lower. Is it possible you have some mechanical issue? Did you rule out EGR? Double check everything distributor related. Reluctor phasing and gap. Make sure the low voltage wires are correct....How's the coil? Could you swap out with the 4.3 coil?......
I still don't know what's wrong with your truck. Just giving ideas.......
