Misfires on Bank 1 - 02 4.6is

[johnqpublic99]

Hi All,

After sending my 02 4.6is to get the transmission repaired, it came back with a rough idle a the CEL on with codes 1341, 1343, 1345, 1347 & 1349... all on Bank 1.

Now this vehicle had been sitting for 2 years before I decided I wanted to drive it again so the first thing I did was fill the gas tank with fresh high-test fuel... I also cleared the codes and disconnected/reconnected the battery.

I spent a few days driving it hoping the issue would resolve itself but it hasn't... last night I decided to change the plugs to see if it would have an impact but it hasn't.

Looking at the codes themselves, I noticed that those are misfires related to fuel cutoff. I've spent the day reading other threads on the subject but haven't found a clear indication on what the issue might be.

-CCV - has never been replaced so not sure if that could contribute.
-Vanos solenoid?
-OSV? This has been changed in the past and hoses replaced but could the transmission shop have knocked the hose off and cause a vacuum leak?
-Other vacuum leak that would affect only one bank?
-Throttle body or MAF needs cleaning?
-Ground problem on Bank 1?
-Dirty injectors?
-Crank position sensor?

I unplugged the MAF as some have suggested and it had no impact. I should specify that this issue only occurs at idle and as soon as I touch the throttle, the engine smooths out and operates normally.

Tonight I plan on looking at the OSV again, cleaning the throttle body and possibly looking at cleaning/testing the injectors using this method (https://www.youtube.com/watch?v=ffdPCno5izU) and run a temporary ground to each injector.

Anything else I should consider?

Thanks
DF