What would cause every error message there is on 2000 cont. be caused by? on 2000 Lincoln Continental

traction control off, air ride suspension, stalls when driving and when not, idling racing or too slow and make car shake, windows going up and down, steering hard then too easy almost had wreck. happens all the time. ghost car

Asked by for the 2000 Lincoln Continental
could have a bad ground or a pcm problem
Thanks. Was dreading PCM. I wonder how much that is?