ok i was in the shop today and someone brought their car in and siad something was wrong with theri computer so i checked a few things and realized it was the computer...we replaced the chip in it and it smoothed evertything out problem solved this was on a 90 model cavalier(i think) so those cheap computer chips on ebay for like $30 do those actually optimize your power?? it says it tunes the fuel and what not anyone have one? do u like it, no diffrence??

 

I don't think they make that much of a difference but I have not tried one before.

 

anyone have this?