Ok, so we got this 1995 Riv in the shop today that likes to run awhile and then it dies. A couple of the kids in my class thought that changing the PCM would help since there was a huge decrease in voltage when they did the V drop test on it(something was draining the battery). That part sorta fixed the problem, but now the car is throwing a PO321 and PO341 code and dying at all speeds. We took it out for a test drive and it died after only about 1 mile and would not stay running long enough to even turn the car around. It'* now added 2 more codes, but I can't think what they are off the top of my head right now. The car doesn't readily start either. I'm out of ideas, so what do you guys think this is? Keep in mind that there were no SES lights on before the PCM was changed and it ran fine other than it eventually died.

Did yall switch out the PROM chip when you changed it

Check fuel pressure, ICM, and if good, change the crank sensor. No guaranties, but I've lived with and loved one for quite awhile.

Yes, we switched the chip. As far as the crank sensor, it'* brand new.