rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!

[amstaffbair]

I have an o3 h2 with 80 g miles on it . I am having some issues with truck surging in low rpms. Right around 12 to 1500 rpms it starts to bounce up and down. you can feel it terribly. I had a stage 2 jet chip in at one time time and thats when i started to notice it .. ( never notice a power difference with chip in). SO i took chip out and its still doing it!
Its gets better if i run 93 octane. I was wonder if the truck is not liking all the ethonal in this new so called gas our stores are selling??

Anybody have this problem???

ALso what kind of tune up should i do at 80,000 miles??

thanks

Andy