90 MM Rough Idle And Bad Gas Milage

[lush90]

Just a thought but did you change your timing? If it's off, you can get the results you have, rough idle and poor mileage.

[jbrockman]

Replace the O2 sensor and see what happens. It's dumping in fuel for some reason.

Ill pick one up and see what happens. I tried the o2 from the 91 but it wouldn't idle, it kept dieing

That chart is cool how did you set that up?

Using fuelly.com as long as you fill your tank every time it will keep track for you and its free.

Just a thought but did you change your timing? If it's off, you can get the results you have, rough idle and poor mileage.

I don't think that's it, it got worse over a few tanks and same running problem with 2 different engines.