[Budfreak]

since i've bought the car about 6 months ago, it's always had it's little periods where it would idle up and down between 1000 rpm and nearly stalling,and sometimes it will die when i put it in gear. but now the problem seems to be happening more since it warmed up outside. also, my gas mileage is absolute crap. i consistently get 200 miles to a tank and it's killing me with the price of premium nowadays.but, every now and again it will get like 300 to 375 to a tank but it's rare. the only thing i've done is bypass the throttle body coolant and put in a k&n airfilter. i run fuel injection cleaner all the time and keep the throttle body clean and so on. i just changed the pcv valve too. any help would be great.