1997 Toyota 4Runner Questions

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Early 3rd gen ABS sucks. I disabled mine by pulling the fuse under the hood (which the fuse block must be unbolted and the ABS fuse is held by a screw underneath). Many will say not to disable ABS, but it was the right thing for me because mine would kick on way too much and wouldn't stop my truck in a reasonable amount of time.
The idle on my truck idles high, and sometimes it will gl up and down. It's getting worse. Could it be my catalatic converter?
Fast idle, then idle speed goes up and down? Any suggestions?
How will my truck act like when my h2o sensor is going out?
Belt squeels when heater turned on. Do these have timing chain
no power at turn key. pump is brand new

I have overheating car with leakage from blown head gasket will using the sealant repair the water pump leakage
4Runner starts in Neutral and will engage drive and reverse. Will not go into park. I can turn the engine off in Neutral, however since it won't go into park I can't turn the ignition switch all the way off.
I have a 5 mi. drive to work, morning drive is fine. 90* temps on way home in stop and go traffic seem to lock up brakes after 3 or 4 mi. Acceration is difficult and vehicle slows much to fast plus brake pedal has no play. mechanic says brakes and calipers fine. i replaced catilytic converter recommended by my mechanic and no change, what else may be causing problem. Mechanic now suggests transmission issues and i don't agree. These are expensive fixes for guess work. 4runner has 294,000 and have had no problems until 2 weeks ago.
Truck loses power. Dies. Used to jump it. Bang on starter. It would start. Replaced starter. Still had to jump it. Replaced battery. All in past week. Ran maybe 2hrs. Lost power. Won't jump now. Nothing. Had to tow it home. I'm guessing new alternator. And belts. Also has some weird wiring issues. Need it to run.
I need some info
I have a 97 toyota 4runner with 170,00 miles, over last several weeks has blown intermittent blue smoke out of exhaust at start up, stops usually within a few minutes. in last week have noticed power difference when under load, also intermittent. replaced PCV and related vacuum hoses. no change. is there anything to check / could be causing it other than valves or worse engine issues? Appreciate your help.
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