Check engine light came on in 2003 Lincoln LS, 3.9 ltr. Pulled code of PO193. Changed gas filter, nothing. Changed all 8 spark plugs and still getting same code. Just finished changing all 8 fuel injectors 4 at a time and now I am getting PO193 and PO358 codes. What gives? Do I have a bad coil or what?

check coolant level -oil level and condition if milky --but water in spark plug holes is an indication of blown head gasket --cracked head--block or intake

Pull the MAF sensor and give it a cleaning the correct way.Sometimes something shorts those probes(tiny wires and delicate) and your engine will cut a shine on you.
Look up how to clean the MAF sensor if you don't know how. don-ohio

My car is a 2003 ls V6 keeps getting a misfire and no acceleration when pressing the gas. I've done changed the map sensor, new throttle body, coul packs and spark plugs 3 times and just recently re changed them once again and noticed the spark plug holes were completely filled with water. Anyone with possible answers would be helpful

When you changed spark plugs did you notice any oil on the insulator or wire plug? Or any oil in the hole that the spark plugs are in? This model of LS were built with gaskets that seem to always fail. Lincoln came out with new gaskets in 2002 or 2003. If there was any oil in the above mentioned places your coils (COP Coil on plug) could be shorting out due to the oil degrading the insulator on the cops.The fix for this is to replace the valve cover gasket set with the upgraded set. Also it's almost impossible to find which coil is bad, and I recommend replacing all eight of the COPS. You can find them online pretty reasonable. I have used these and they seem to perform as good as the Dealer parts, but at a fraction of the cost. This solved the problem on my 2001 LS V8. Also these cars are known to have problems with the timing chains, which could also cause your problem. The adjuster shoes that keep the timing chain tight are plastic and wear out and come loose. Some times causing the engine to jump time and in the worst case could allow the pistons and the valves to come in contact. That will destroy the engine.

Cylinder 3 Misfire Detected is a P0303

You don't have wires,you have COP-Coil-On-Plug system.
If you have the codes,you could change the coils yourself.Their $59.00 at the auto parts store.

There is a misconception about tune-ups.
You only have spark plugs,and air filter,that would need replacing,that effect engine performance (Tune-Up)
Also, you can Clean the MAF Sensor,in the ducting,between the air filter and throttle body,with CRC MAF Cleaner. You could spray the inlet to the throttle
body,but I wouldn't bother.
I consider plugs& filters ,general preventative maintainance,nothing really tunes the engine,but it's own processors.

If you remove the coil cover, on top of the valve cover,you access the coils.Have to remove the coils to get to the plugs. The plugs aren't your issue,unless they have been in the engine for years or the valve cover O"Rings are leaking oil onto the plugs. Three coils seems questionable.

Get me the codes!

I have the same problem. My Lincoln Ls wrench light comes on and it quits. All spark plugs, all coils and the throttle body has been replaced. I think the LS model is a lemon! Any information or suggestions will be appreciated.
Thanks, Betty

Misfire from one or more of your cylinders, Have the code scanned. Most likely going to need coil(s) and spark plugs to fix the problem.

this sounds like an engine misfire, the check engine light is telling you it is misfiring. next time the light is on you should go to an auto parts store as most of them will pull the code for you at no charge. I own a 2002 LS and I have replaced 4 coils in less than one year to correct this same problem.

the missfire can be caused faulty leads and spark plugs replace spark plugs and leads reset codes by removing engine fuse for 10 sec road test and check codes if the lean on bank 2 comes back you may have a faulty injector or intake manifold leak try some injector cleaner in the fuel overdose it it wont hurt