Thread: Help with cruise rpms

I've just recently noticed that when I am cruising around 100km/h (60mph) my rpm's jump up and down between 1500 and 1000.

I have a video that I will post when I get home from work.

Any ideas as to what would be causing this?

I have cleaned my MAF, IAT and throttle body, but no difference.
No CEL.

Please help,
Thanks

Originally Posted by BillBoost37

Lockup is probably more. Although the osciallation could be the issue.

When was the car's last tune of up spark plugs and wires?

I just put new ngk wires on and plugs were done in may 2011.
When I changed the wires I noticed one of the coil pack connections was kind of rusted, and I forgot to wire brush it off, I'm going to try that tonight and see if I notice a change.

I forgot to add that it was after I got my overkill pcm that it started.

here is the video to show what I mean.

So i put all new copper plugs and it is still doing it. so i guess its the lockup..

Originally Posted by BillBoost37

How did the wires and coils look?

wires were good there pretty much brand new. the coils do seem to have some stuff on them, i wire brushed them as much as i could. but theres still some rust/black stuff left.

Originally Posted by tms8582

Does this happen with your foot on the gas pedal or with cruise control on?

No it only happens when I am coasting.

sorry to bring up an old post, but how would I fix this problem, is it worth the trouble?

updated video of problem. and a thread of all the troubleshooting I have done: EricTheCarGuy

Originally Posted by gtpsleeper

what are you scanning with?

A Scangauge II