when i first turn my car on in the morning after about 30 seconds of warming up it starts to rev up to about 2k rpm and drops to about 500 rpm and makes the entire car shake. It does this over and over until the car is warmed up. This has been happening for a while and it started with it going to about 1300 rpm and dropping to like 800 rpm but after a while it got worse. What could be wrong?

mine is similar(when cold), but u may want to clean out your throttle body... or change your plugs/gap on em/wires....

good luck

03 srt-4 13.130@112.47mph (n2o, stock turbo, 10/2003)
now: 20g, portfueler, bpu+++ (track/dyno times tbd...)

i farted on your wiki

gap your plugs, that fixed that problem for me. .050 give or take .002



'96 Eclipse RS
Clear corners, custom airbox

Smiley face 4 life!

Jaeson
'96 Eclipse RS

I got that same problem. could be o2 sensor related cuz my rear o2 has been shit for over a year



HRC Stage 2

http://piq03.ofoto.com/photo/?cmd=initialize&compress=80&src=http%3A//im5.ofoto.com/photos211/3/23/29/99/80/0/80992923303_0_ALB.jpg&srctype=image/jpeg&aspect=1.5&cropbehavior=cropCurrAspectRatio&type=image%2Fjpeg&width=368&height=368&req=1013294527851&ses

the rear O2 sensor won't cause the car to run any different, even if it is completely not working. Only the front O2 sensor will cause the car to run differently.
The rear one just tells the comp. if the cat is working, that's it.