my cars a 91 accord at...when my car is warmed up the rpm's bounce from say 1000 to 1500 back and forth...the car runs fine when driving..any ideas what the prob is???thanks

 

id check for ignition problems or the tyranny fluid or perhaps a vacuum leak any hoses loose or holes in them?

 

is the bouncing fast or intermittant? Does is idle like you've got a cam or does it seem to "get stuck" at 1500rpm and then kick down to 1000rpm after awhile?

 

check your TP sensor

 

theres no pause it just keeps bouncing but it only does this when the car is warm

 

if it were a vacum problem it would idle at higer rpm's with out giving it gas.
you could check your PC valve that runs on top of your valve cover to intake manafold if it dose not click when you move it up and down that means it's stuck
but you would burn oil also so that would be a give a way.
check your resistor box,plugs,timing, speed sensor. it dosent sound like any thing major. i'm willing to bet a 100$ it's a tp sensor.
good luck,
need parts? i got a boat load of accord parts, find your problem may be i can help you out.

 

thanks alot for the info...ill bring it to my mechanic to find out the prob..and if i do need parts...you'll be the first i ask....thanks again....ill get back to ya

 

bad FIV

remove it and plug the holes or replace it

 

i have the same problem so try changing ur IAC valve if not its ur TPS just use a multimeter and go by the book to see if these sensors are bad if not i have no idea right now