I have been driving my truck and for 3 years wondered why it would sometime feel like it would just like slug for a split second every 45 seconds or so. I really never thought to much of it since I only would notice it while I was driving w/o the radio or just on a smooth quiet road. Well, today I put 2 and 2 together and came to a conclusion. I hooked up the Prdator on the way home from work and wanted to see if anything jumped out during one of these slugs. Well it did an the A/C is the culprit. with the A/C on it would do this and pull timing fom 46+/-* to ~22*. When the A/C was off, I got a flatline 46.4*

 

WOW! The ac in not engaged at WOT though, Right?

 

Right! this was done at steady speeds and with the cruise control on most of the time.

 

man that is good info! thanks!

 

you never realized that the A/C kills power when on???

 

Fast4.8 Check your timing tables, you may want to do some smoothing....

 

A/C automatically turns off at WOT blownchevy, you are correct

 

Why the hell does it pull timing? My truck does this too, it took me a while to learn to just ignore it.

 

anyone had a truck added to their edit cable for a f-body? i think i need to send mine off and get it done if so.

i noticed the same thing on mine.