I have a 2002 Sierra with 5.3V8, have installed Comp Cam 212/218 522/529 114LSA. Also have Throttle body spacer and shorty headers with drop in K&N airfilter. At idle I have a very bad lope as it warms up, but changes to a mild lope after it warms up. Have toyed with some changes but only made things worse so I went back to original settings. It acts like it is too rich as it warms up, and when it loads up, sometimes it trips the SES light with a code P0300 misfire. If there is anyone near me that could give some pointers, or drop a message here, that would help. Would really like to get this thing ironed out. I live near Indy, thanks.