mustang90242

for some reason when my car idles the rpms go up and down from 1000 to 200 rpms and once the car turned off on me but started rite away when i turned it on again.

someone told me it had to do with running rich

does anyone have any solutions?

19stang88

your throttle body could have something stuck, or some sort of build up. check your intake system, could be the reason why youre running rich. did this happen all of a sudden?

Five0hFox

check for vacuum leaks?

zebo87

i agree with the vacuum leaks.

mustang90242

it all looks fine

mustang90242

yes it happened all of a sudden

TrimDrip

put a vacuum tester on it

mustang90242

how would i test it though?

Liquid_02

Won't be a vac leak if it's surging. Surging is due to a rich condition, meaning, not enough air is getting in, or too much fuel. A vac leak allows more air to get in, causing the idle to go up.

Try creating a vac leak and see what happens. Just pull a vac line off with engine running and see if it cleans itself up a bit. Could be your IAC not allowing enough air into the engine.

TrimDrip

with a gauge...does it ever clear up for a little while?

A vacuum leak while cause it to smell like fuel out the pipes at idle.

They will also idle high at times and surge at others.