How do I test PCM
 

I have a 2001 Exp giving a P0352 code. plug good,COP good. Hodo I test PCM?

For which cylinder did you test the plug and COP?

#2 which was the indicated bad cylinder with the P0352 error code

Just checking, I wasn't intending to insult. You'd be surprise at how many people get the wrong cylinder. Now back to my question, sorry I wasn't specific. What I was really looking for is the physical location of the cylinder you checked. As in which side and how far back from the front. The #2 is the second one back on the passenger side. Is that the one you checked?

Didnt mean to be a smart ass. Im relatively new to working on engines and just wanted to give good info. I checked the 2nd cylinder back on the passenger side. COP is good and new plug. there is a problem with the connector coming off harness in that the clip mechanism is broken so connector is not locked in.However when I manually held connection tight while the engine was running no improvement was apparent with rough idle.

To me it sounds like your PCM is good. Based on the P0352 code I'd say you're on track with the harness connector. That code usually means that you have a connection to the COP but it's not a good one. So what you're looking to solve is a high resistance issue.

Ive got a 1999 crown vic. Can I clip connector of it and sodder to faulty clip on Exp

If the clip fits, wear it! :)

How is the clip on the #2 injector? Is it on and tight? Be careful when working arount the COPs as they put out a very healthy jolt.