WHEN ENGINE FIRST START RPM GOES UP FOR 2 MINUTES THEN DROPS.

It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. When the engine first starts the idle air control motor should raise the speed to about 1200 or 1000 rpms but then drop don to 750 rpm when the engine is warmed up and no electrical loads are on. Was it the throttle position switch you replaced? If so is it properly adjusted? Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online