Chrysler Repair: 1999 Sebring Convertible Limited 2.5 engine, crank shaft, aftermarket distributor

Question
First, let me say, I love my car!  Not loving the money I have recently put into it.  Replaced the following in Feb of 2005.  Value vent, crank shaft sensor, vapor canistor and tie rods.  Replaced the following in the last nine months.  Battery, alternator, starter motor, distributor, wires,etc. as well as the transmission return line. Its been running fine.  Driving down the highway a month ago and it developed a mind of its own! It started to "skip" never died out, just skipped between driving speed and no speed.  The RPM needle was jumping and arcing and then the "service engine" light came in.  Stuck on the highway, I kept driving and shortly thereafter, the battery light also came on.  Brought it to three different places, got three different responses.  One was the crank shaft sensor, one was the distributor, (both have been replaced). Third was the PCM (possibly).  Makes sense that a bad PCM might give me the other false codes, but how do I know for sure.  Different prices as well.  $485 to install and reset to $600.  Whats a girl to do.  Can I replace the PCm with one from a "boneyard"? Had my car towed and was told my oil pan needs to be replaced.  Can either of these things be easily replaced at home? Is there something I can do to seal the oil pan without replacing it.  Oh, did I mention that my engine has 201,000 miles on it and it runs like a charm!  Hate to throw in the towel but how much is to much.  It's practially rebuilt already! Worth the continued investment if I eventually had to replace the engine? Still cheaper in the long run than a new car and the dreaded payments.  HELP! Can I replace the PCM and oil pan without much difficulty and how would I reset it?  Thanks.

Answer
well lets see  first of all the alternator did not haft to be replaced so that was a waste of money. U more then likely put an aftermarket distributor in  so that is always a prob. What were the codes that they pulled from the PCM  and no u can not put a PCM in from a junk yard it will cause more trouble and money then u have. Aftermarket parts like spark plugs and wires and distributions cause all kinda issues.