every once and a while, my car wont idle, i havent been able to connect it to hot or cold temp or hot or ambiant temp so im not sure if there is a rhyme or reason. but even in gear it just wont idle uless my foot is on the gas, but will still drive. then sometimes it will idle to high (1100 range). id say its about even like 1/3 of the time normal, 1/3 too low, 1/3 to high....i know i need plugs and wires, and i also need valve seals.

i think thats all the info i have....im thinking if none of that maybe a sticky float???