I have a 02 Lincoln LS V6 that runs very bad when its cold. I have replaced the valve cover gaskets, plugs, coil packs and the pcv valve with the rubber elbow. The car runs fine once it gets warm but will shoot a P0136 and a P0156 diagnostic code in stop and go traffic. I need help bad.

You are right about the valve cover gaskets. The gaskets fail and oil fills the sparkplug wells with oil. The rubber boots get oil soaked causing the spark to short out which causes the coils to go bad. The only fix is to replace the gaskets.
I replaced the gaskets and the COPS(coil on plugs) over a year ago, and haven't had anymore problems with the coils. I bought the valve cover gaskets from the local Ford-Lincoln dealer. Lincoln up graded the gaskets in late 2002, and from what I have heard, they are the best you can buy.. I bought all 8 COPS on a popular online auction from a seller with excellent feedback, and saved quite a bit of money. You should replace any COP that has oil on it. I replaced all of them so I wouldn't have to do it again! It took about an hour to install the gaskets and COPS.Make sure that you get all of the oil out of the sparkplug wells. I also replaced the sparkplugs.

Without seeing the car would say to do these things. Check for vacuum leaks on hoses, see that the mass air sensors is hooked up properly. Look for exhaust leaks, there could be air **** in causing the oxygen sensor be thrown off. Look at the oxygen sensors to make sure they're not damaged. Next check the ignition system. If the mis is constant disconnect one sparkplug at a time until you find which cylinder is missing. Switch coil packs to another cylinder to verify this. If the ignition seems OK you might have a bad sensor. Mass air or throttle position sensor. Good luck.

You have COP Coil-On-Plug ignition system. A coil on top of each spark plug,no wires.

On the V6, the coils are in the middle of the valve covers

On the V8,you remove the coil covers on top and in the middle of the valve covers.

Do not be putting a meter on them,as you won't see the primary ,unless the Ignition Pulse Wheel is turning and the CPS has an output.
If you touch the ground side,you will take out the PCM drivers.

A PO-301 to PO-308 Code,could mean a bad coil. The last # is the Cylinder

that is an oxegen sensor code front sensor bank 1.its on the side of the engine were #1 cylinder is located.probably bad, but it could be disconnected partialy or shorted to ground

coil and plugs

Most likely an oil leak around the ignition coil packs in the valve covers. Remove the center covers on the valve covers and remove the coil packs and see if you have oil in the spark plug wells and on the coil pack boots. If so you will have to replace valve cover gaskets and the orings around the coil pack holes. You can also get the coil pack boots separately if the are oil saturated.

I was having the same problem between 40 and 50 as well as the miss fires after changing a coil that was miss firing one it reached running temp. the problem vanished so check your coils.

Most likely what has happened is that when the thermostat went out the engine over heated and the seal of the valve gaskets to the plastic valve covers got warped and you ahve oil the has dumped into the coil pack area and it has caused 1 or more of the coil packs to go bad as solution #1 has explained. get the gaskets replaced, it sounds like your husband is handy. Its not a difficult procedure just a little time consuming. research the coil packs because at the dealership they are very expensive. People have had alot of good luck buying them on ebay.

It is on the Driver side of engine in between the COP's (Coil on plugs) simply unplug the wire use a 19 or 3/4 deep well socket and unscrew it and put it new one... The whole process should only take 10-15 minutes.

2002 linclon ls 3.0 v6 pcv location