please help!! this has been a problem for like 1 years and no its getting so bad i don't want to drive it. i will start it, and it will tack 2 grand. oh ya this is 98 d16y8. 3-5 mins later it will tack 1,500. and it is never a constant idle. the needle moves up and down like 300rpm. so when the engine warms up i shut off the car and turn it back on. it will idle between 700-900rpm always moving. so then i take off and it did drive fine until two days ago it started to like choke in the rpm range. always in a differnt point too. like it stumbles for a second then runs fine again. then when i stop the idle sticks at 1500 for like 30 secs and proceeds to fall down to 500rpm then bounces around 700-900. so i have checked the MAP and TPS volts/signal they are fine. i have replaced the pcv valve, the AIC, fuel filter, plugs, wires, cap, and rotor. checked the map and tps today because the check engine light came on. the engine light is also on for the secondary o2. i have also searched high and low for a vacum leak, and replaced the intake manifold gasket a month ago. at the same time of the gasket i set my timming. PLEASE HELP