lean at idle, rich while crusing

[Mr Lee5353]

my car is doing some funny business. at idle and part throttle the car will go lean, but when im more than part throttle or just crusing down the highway it will run rich. my uego reads it going from really lean to completely rich, never in between. at normal fuel pressure, its so lean at idle it boggs and pops. ive turned the fuel pressure up high enough so its not running super lean in fear of messing crap up. ive got a few ideas of what it could be, but i dont have the money to just run put and buy 5 parts "just to see" haha. anyone have any ideas of what it could be? tps? o2? iacv?

[schanne]

check for vaccume leaks. check all that you put on the list

[Mr Lee5353]

its also doing this thing where when its warm and i start it itll rev for like 1 second then just turn off

[freakyjason]

Do you have a fuel pressure gauge? What's the pressure at idle? Also, is it actually a problem to be running lean at idle when there is no load? Is it an issue to run lean if your egt and general temp still stay low?

[virus77]

boost leak, pressure test it.