Oldsmobile Silhouette Questions

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Won't start after it died, it shut down one day tried starting but stalled right away towed it home next day I got it running had to feather gas to keep it running,after that it hasn't started at all did fuel pressure check was at 40 psi, changed fuel filter still nothing, changed fuel pump, still nothing now pump won't turn on, rewired plug bank behind driver seat pump turns on now, still won't start replaced fuel pressure regulator still won't start, relay and fuse was also changed, no cracks in fuel lines either don't know what pressure is at now gage is with my brother... But just trickles out of port when pin is pressed in.. PLEASE HELP!!!!
My van broke down at my parents last night and my dad thinks it was bc it was on a hill and low on gas, but when it wouldn't start last night the power door wouldn't work either. He says it's running night that he added more gas to it, but the power sliding door not working makes me think something else is slowly going out like the alternator.
Not to long ago the hose for the coolant collapsed and came undone and all my antifreeze and stuff went everywhere. We fixed that but ever since then, the gage indicates that the car is overheating but it isn't overheating. Then a new problem acured with that, it would start to shake and lose all power and she would be stuck in gear when the gage indicated she was hot.
Was reading up on Intake Manifold Gaskets and not sure how to tell if it is a bad thermostat or intake manifold gasket that could be causing my van to overheat all the time. Does anybody know of any very different signs to tell which one would be the problem ??? don't want to replace one to find out it's something else.....
I had read somewhere online that when you replace a thermostat you should replace the water hose as well ????? Is there any common things that are best replaced as well when replacing a thermostat ?
My van continues to overheat more and more everyday which never started till the weather dropped down to around 25 degrees. It seems like the distance I can go before I have to pull over and let it cool down is becoming less and less. I have been topping it off with antifreeze everyday but it doesn't seem to help at all and everything I put in it seems to disappear into thin air. I have a new thermostat for it but nobody wants to put it in because they say it's a pain in the but as well as a 4-5 hour job......
I lost all warm air, then noticed the light blinking HEAT/COOLANT, I was losing power while driving and the thermostat went to High. Nothing seems to be leaking and there is still fluid in my tank. I need a diagnosis so I can fix.
I tried the 2 and 3 combination with the ignition on and it will not give me any codes. just frozen on LOCKED. my van has the controls in the rear also if that may make a difference not sure.
It started about a month ago. I'll be driving along and they repeatedly lock or unlock, sometimes 10 to 15 times in a single episode and it happens almost constantly while driving. I stopped using the key fob and now lock the doors with the key. I've tried disconnecting the driver side actuator but it still does it. The passenger side power sliding door has also stopped working. Could it be a short or something in the computer?
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