i have a 95 silverado 305 tbi i was driving it on a sat morning when i noticed it was idling kinda hight i shut it off went in the store came out and it was fine till the next day i was driving and the idle went up to around 1200 rpm and was running really rough since when i start it the rpm goes right to 1300 or so and it runs rough the whole time it has a newer tps and a iac but i dont know whats wrong should i replace the tps again and see or can anyone help me?

You should check for vacuum leaks, especially around the base of the TBI.

A bad Engine Coolant Temp sensor can also cause a high idle since a cold engine needs more fuel than a warm engine.

//2000CAYukon

Check or replace the TBI base gasket.
MT