Gsx_josh

My car is an 2005 evo 8, it's had an intermittent misfire problem that I attributed to a bad 02 and fouled plugs, changed those and it got better for a couple weeks, now it's misfiring really badly, like at 60 on the freeway, but it idles perfect, no fluctuation or anything, I checked it with an obII scantool while there's no code for it it but it said my maf g/s was 0 when the vehicle speed was 57 at 18% throttle, is this normal or is maf toast?

allevolution

iTrader: (2)

I doubt the maf has anything to do with a misfire lol
I would check the ignition connections.

And make sure youre using iridium plugs gaped to the right spec

Gsx_josh

The maf tells the ecu how much airflow is coming in to calculate the fuel mixture, can too rich or too lean cause a misfire? Lol...........

VWJETTY

iTrader: (7)

swap out your maf. there's only a few things that could be wrong.

MAF
plugs
wires
injector
fuel pressure regulator
injector resistor pack

alicea8541

iTrader: (32)

When my MAF went bad it also had a check engine light along with it. My gas mileage was absolutely horrible. I was putting gas in it every other day just to get to and from work which was only a 40 mile round trip each day.

SaulHudson

iTrader: (5)

Usually bad MAF will affect idle too, but it is a possible cause.

Bysek

Anytime I had a maf issue the car would not idle properly..

Gsx_josh

Thanks to those that contributed, I know I've got a couple boost leaks still but it was def the maf, swapped in new one and problem is gone!