Engine seems to be running too much?!?! plz help

Hey guys i am having some trouble with my Tacoma. I havent had gas in the tank for a while and have now just refilled it. I started the truck but it took me 2 tries. on that 2nd try that engine hesitated to start up. and was at 1k rpm. and the engine slowly elevated to 2.5k rpm at a warm engine temp. im not too sure why, usually when my engine is warm the rpms drop to 1k. I need Ur help guys to solve this problem. Much help is appreciated. 2.7l engine 03 tacoma sr5 xtra cab.