non consistant idle. vac line? rear 02 sens?

[mnnice]

i have a 95 awd talon. no mods are done other than bored 20 over, small 16g tubro, 2.5 turbo back exhaust. now i just got the car done and it doesnt like to idle right. when its cold it idles really low sometimes i have to help it out a little to keep it running. when it gets warm it idles really high around the 2 grand to 23 hundred area.

the cel light is on and the codes were for a tps and rear 02 sensor. i figured it would just be the tps so i replaced that and nothing happend.

could the rear 02 cause a odd idle? or would it more than likly be a vac line? ive been told im probably missing a vacum line somewhere but have no idea where to start.