After Principle, Interest, Tax, Insurance, money set aside for Maintenance/improvements, Property Management, Utilities etc, is it cashflowing?

You cannot exchange for improvements on property you already own. 

The home, as-is, can work but it needs improvements and updating. 

I would not try to use your real estate investment strategy as your 'improve your credit score' strategy. 

Told him to leave ill do it myself.)Bad sill plate on rear corner (contractor)Replace front porch postsBuild backporch stepsDemo barnInstalling concrete footers under home, laying block and shimming to your jacked levelSetting house back down on blocks and reattaching to foundationRemove floor and portions of subfloor in kitchen & back porch and replacement Window repairTemporary power pole (electrician)Electrical service upgrade, outlet replacement and GFCI Install (mix of Electrician and us)Label panels (electrician)All exposed wiring must be protected (basically just replaced all of it)Replace missing light fixtures (new fans throughout)Build wall in living room to convert to 3rdbedroomRe plumb house and pressure test plumbing (plumber)Install smoke detectors hardwired to meet code (electrician)Water Heater electrical line, and core discharge for water heater under house (plumber)Tear out Old ac unit under houseWindow screensWindow locksBackflow prevention valve (plumber)Fart fan ventilation for bathroomApproved Address Number DisplayedFlaking paint abatement interiorClothes Dryer exhaustPaint Untreated woodRemove all debris, Remove old tiresRemove chain link fenceTreat house for black antsPoly floorsMud and paint wallsAppliancesDoors/locks.Roof patch, remove 12x24 section, cut out rot, sister in new beams, put new plywood & shinglesPiles and piles of new electrical wiring (electrician/us)Sand all walls and spray texture ceiling and walls with joint compoundPaint whole house inside and outNew trim everywhere.Sand the every living hell out of the floors (100 hours of labor + help)Gutters and french drainNew mailboxA/c Unit.

Any ideas to improve?

I'm still figuring out how to improve the free marketing that works, for those of us with fewer units.

We bought for $133k and replaced the flooring, updated one of the kitchens - (a duplex) painted, and made a few other improvements.

Asking price is $159,000 and the house immediately next door sold for $599,000 but a few other houses in the neighborhood sold for much less but still above $159K.The house could definitely be rehabbed and improved both inside and the exteriorSo, here’s my question:Should I buy this house at $159K, rehab it, and hope it sells for around $599K?

You cannot change location, and you can only improve the house itself, not the neighbors.