Check Engine Light and codes

Hello All,
I recently purchased a 2002 X-type 3.0. I think that I am going to get to like it. Being a Beamerhead for the past 25 years, I thought I would try a Jag.
However, the car had several problems, this is the story 1 of 2;

I went to AUTOZONE and rented the DTC reader for a few days
1. It had the dtc of p0171, p0174, check engine light on and cruise not available

I searched around the forums for solutions. (You guys are sharp!)

I then broke out my can of starting fluid, started the engine and begin to spray. I sprayed the IMTs, the pipe to the brake booster, the other hose that comes off top of the throttle body (TB) and the PVC hose, to no avail.

So I removed the TB to take a look around and WALLA! There laying on the rear valve cover was a SMASHED PIPE (repaired by inserting both ends into a section of gas line). The TB was not properly installed, instead of being secured to the lower mount (on the side of the valve cover) it was all the way down, pinning the pipe between itself and the valve cover. After reassembly, I cleared the codes, drive it for a few days with no problem.

I then returned the DTC reader back to Autozone. While there I figured I would get a can of Seabreeeze to clean my injectors. I filled the car up with premium gas and added the Seabreeze.

Later that evening, I had to fly out of town and it’s approximately 50 mile trip to the airport, so off I went. During the trip the check engine light came on. I noticed no difference in the car’s performance.

Upon my return home, I went to Autozone to have the codes read and there were p0300, p0301, p0302, p0303, p0305, p0420, p0430 and p1316.
With this combination of codes indicating a misfire and NO p0304, I figured that this was caused by the Seabreeze (injector cleaning). Is my logic sound?
The car runs smooth
Because of a lawsuit Autozone can’t reset or rent the DTC Reader tool. The person that rented me the tool before was reprimanded.
Anyway, MY PROBLEM IS – HOW DO YOU CLEAR THE DTC CODES AND THE CHECK ENGINE LIGHT WITHOUT A TOOL?
I have:
1.tried removing the negative battery terminal for more than an hour
2.tried removing F32 from the fuse box under the hood
3.tried the reset / trip reset button (never got the timing right)
4.have cold started the car more than 10 times

Thanks in advance for your help.
Mike L.

Did you get this problem fixed?

It sounds like unmetered air from the PCV system, causing lean conditions, random misfires, and Hard starts.
Reset code-
1) Disconnect both connections to the battery.
2) Touch the cars pos cable to gnd, this will discharge and reset the computer + control modules.