P0300 code with cel on

[txab]

What was fuel pressure reading? Key on, engine off

[searay220]

There was 56 psi at key on - engine off

There was 59-60 psi engine running.

 

I had it back in the shop yesterday and they said there was no power the pink wire at the o2 sensor (bank 2,sensor 2). They think the original o2 sensor shorted the ECM. that;s why no change after replacing sensor.

 

So does that mean new ECM and do you think the misfire code and o2 sensor codes are related.

The shop wasn't sure if they were related. They have seen the misefire being caused by a minor intake leak that cant be detected in the shop. But when on the hightway the CEL starts flashing and that's when the minor intake leak shows it's self.

[txab]

I've had the intake leak at speed but not at idle. Fuel pressure is good

[searay220]

Probably worth doing the intake.I have read there is a design on the intake gasket.