hey, did you ever figure out what was wrong with your avalanche? i'm starting to have the same problem! mine runs fine tho, when started drives fine but just cuts out while driving! each time i had the ac on! you said there was a voltage drop? when ac was on? maybe a bad connection some place? hey let me know! thanks james

 

still working on that problem but i think its my iac or tps

 

Have you tried cleaning the MAS? I know that you already changed the fuel filter, but maybe the sock filter is collapsed or clogged making it starve for fuel. That is what my mother's Astro Van did even after we changed the fuel filter.

 

thanx ima try that

 

i was wondering if anyone figured out the problem yet? my avalanche seems fine til the really hot days when i havta run the AC for a period of time! appreciate any help