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You are indeed a Tiresome Poster. Chasing the helpfull people here around and around and around.
From back when you weren't sure what engine you had, you were directed to on-line sources for Green Books and Trouble Shooting Manuals. You "claim" to have "read them, yet you come back again and again asking questions that ARE ALL Coverd in those publications...with Step by Step Trouble-Shootinf Procedures WRITTEN by VOLVO for its DEALER TECHNICIANS.
Yet you continue to ASK FOR help and then get chased around looking for reasons/solutions as if You have Zero knowledge. When the problem/solution is staring you in the face.
As for your current Problem....the answer lies is THE WIRING HARNESS. AS YOU WROTE.
""""But like i said everything ran fine before I did this belt change, which had me taking off the power steering pump and alternator as I replaced all the mount bushings"""
****************************I must have jostled something or knocked something around and shorted it, the dying engine harness exacerbating any problem.********
"The engine wire harness is definitely something on my list of things to replace. It's pretty shoddy. The two grey plugs on the firewall have several bare wires showing and the rest looks like if I touch it, it will crumble to pieces. Same goes for the alternator area. Those wires are even worse...the fuel pressure sensor ( I believe, above alternator ?) wiring is completely bare with a few strands broken, and the alternator's small spade connector wire looks the same. The harness run below the crank is extremely brittle and stiff. None of the wires that I can see appear to be touching each other, and I have jiggled them and moved them numerous times hoping for a change, but nothing. I know there could be massive problems under the harness wraps though.""""
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