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Ok did some testing. Went out and plugged in to reset the LTFT tables.

Started the engine, hit the reset fuel trims and it ran better for a little bit then the trims came back up to stupid high...

I have not reset the LTFT.. I will look into that.

I just pulled the drivers side plugs and they were sooty, but not completely fouled. I cleaned them (They were brand new 3 months ago and...

Hello tuners, back again..

I now have full exhaust on my van and have a new set of logged issues. I went through the steps on the idle tuning thread...

That was absolutely my problem.

I need to adjust my VE tables back down some, but it idled beautifully at 800-850 RPM and had great throttle response like I had expected. I will find those other...

You are awesome! Thank you so much!

Should I just read the info off the 2000 Yukon PCM I have and copy that way or do I need to use a 2001 Yukon scan since the PCM is a 2001?

Thank you for the quick reply.

In your experience will I save myself headaches just spending the $90 for the credits to crack the Yukon PCM and program it, or would switching the engine to 5.3L in...

Hello tuners.

I have a 5.3/4L60 out of a 2000 Yukon I swapped into a 1969 G10 van.

I replaced many parts on the top end. Swapped to a Summit 8719-1 Truck cam (mild) with new lifters and...