I give up on cavy's...mine has been nothing but trouble for the past couple of months...replaced everything that i know what to do...took it to a tech. at the chevy place...couldn't find anything wrong with it...but every time i press the gas down in drive it acts like it wants to bog out...so...forget it...i have a 1991 Olds. 98 Regency Elite...haha pimp car so ima fix that up.

get the throttle positioning sensor checked out

Yup, check TPS and the EGR.