firebird904

My car has been running beautifully these past few months with an exception, I'm having this completely random high idle (1500-2000 rpm)that will show up out of nowhere and I've had a very small intake backfire that is also very random, and I have to give it some throttle to start up in the morning or it will start up and die, oh and the fan randomly comes on even if its still cool. I have replaced quite a few sensors except the o2 sensor and TPS. Brand new GM MAF was installed with same results. I've replaced CTS, IAC, ATS, and the complete ignition system is new, Injectors are new and have been tested. It's not a huge deal but I would like to have this thing running in tip top shape before I get to installing my DIS kit so that if something doesn't go right it won't be as hard to rule out. Any suggestions?