Help! Bad Idle

[Subi-swap94]

Okay, I was on the freeway in Portland Heading to pick up my girl friend from work.
All of a sudden the car wouldnt hardly idle, could hardly take off on flat ground, when I finally took off it was shuddering super bad when ever I tried to speed up.

Since then, ive changed the plugs, wires, fuel lines, fuel filter, coil, and maf. Fuel pump is good aswell.

Any ideas? Im out...

[rallyak]

Have you checked codes?

[Subi-swap94]

As in check engine lights?
if so there are none...


Also, its an ej20g swapped Turbo legacy if that helps with anything.

[rallyak]

Some times the light will not be on and will have stored codes. This is the first thing you need to do.

Josh, (Site admin) has a great how to on his site and heres the link.

http://www.surrealmirage.com/subaru/engine.html

[Subi-swap94]

If i reset the ecu would that mess up my tune?

[Legacy777]

What are you using for tuning?

[Subi-swap94]

PP6

[Subi-swap94]

also my battery has been disconnected and its still the same as it has been

[Legacy777]

Ok, resetting the ECU should not have any affect on your tune.

[Subi-swap94]

i have another ecu, that i will be trying out today. and if that doesnt work, does anyone have any other ideas that would cause all this?