ECM Testing

Got a 3.4 engine that has a rough idle. Replaced plugs, wires, Oxygen Sensors, and Injectors. Also checked the MAP sensor. This was stuff that needed replacing anyway. The car has about 110,000 miles so I figured that replacing the injectors was not a bad idea.

It has been suggested since I had a variety of codes come up that I might have a bad ECM. My question is:

How do you know or how can you test the ECM??? I notice that some used parts dealers say that their ECM has been tested. Also, where is a good place to find ECMs if I should happen to need one?

Thanks

I'd jsut get one out of a wriecked car and make sure it's the same p/n

What year?

What year?

1995. Got any info??? Thanks.

Well if you've got a 95 auto, then I have a spare ECM that I could sell ya. If it does boil down to you needed to buy a new one. I'd rather not sell it to you if yours turns out to be fine and you didnt need it anyway.

But have you checked the coil packs by any chance? And can you describe the rough idle a little more in detail. Such as, does it sound like it's about to stall out unless you give it some gas on the throttle? Or does idle at a steady rpm, but possibly sounds like it may be missfiring?