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Okay update here. Spent Thursday evening installing the stock air intake and stock upper plenum just to rule them out as suspect, did this while neg terminal was unplugged and did an idle re-learn when all was done (ten minute idle then 2 min AC max idle). This morning I replaced the fuel...

Okay so seems ford did away with the fuel rail mounted schrader valve sometime in 2003. What's the procedure for checking fuel pressure on these cars? Seems I'll need to buy an adaptor of some sort?

I was able to spend a short amount of time yesterday logging some data: WOT test: Rpm ~4k Calc Load: Peak 99.6% Air Flow rate from MAF: Peak 132 g/s Throttle Position: Peak 92% Again correct me if I'm wrong but this ruled out faulty MAF correct? Other info: Fuel rail pressure showed high 40's...

Planing on doing these tests plus forcing a rich condition on the O2's using carb cleaner to check their voltages. When you say "disconnect and plug the intake vacuum line for this test" you're referencing the vacuum line on the FRPS correct? Thanks.

Was able to spend some time today giving the car a once over and logging some data. Heres what I've gotten: RPM idle ~750 RPM STFT 1: -1.6 and 3.1 LTFT 1: 24.2 STFT 2: -6.0 - 2.0 always lower than bank 1 LTFT 2: 25.0 RPM ~1500 RPM STFT 1: 5.0 - 8.0 with a peak of 11 (should have held the rev...

Oh I would not tune it to fix the code. Not unless I was certain the bolt on's were causing it. Like I said I'm new to working on cars with performance parts. I know at a certain point certain parts require you to tune, I was just unsure when that point was.

New Ford PI intake with the basic felpro gasket. I should have run a bead of RTV on the heads though they were a little pitted. So if there is a leak at the manifold it's probably there but very small. I'd personally lean toward one of the old brittle vac line broke during the install.

Reader came today. GF was in a rush so I was only able to get long and short term data at idle for about 20 seconds. Bank one Long term was 25% Short term bounced around between -1 and 9 Bank two long term 25% Short term between -.8 and 6 (this bank almost always lower than bank one if that...

that's my biggest suspicion as well. I'm making an impromptu smoke machine this weekend to see if I can find the probable leak.

Batt was disconnected during entire intake manifold swap. Code returned in a matter of days.

Okay so I'm more mechanically inclined then the average person been working on my own cars as long as I've been driving. But I never owned or worked on a stang before, still learning the in's and outs. My girlfriend drives a 03 gt vert that she purchased used with some after market bolt-on...