2000 GMC Jimmy Questions

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runs rough on highway
Yesterday my 2000 jimmy wouldn't start security light was flashing. Now I reset that by opening driver door and locking them and shutting it. Now it turns over but won't start. Fuel is going through. Just have no clue what's going on. I know the o2 sensor is bad. Could that be it?
I discovered this when I was checking my oil. is this a sign that my fuel pump is bad
Shouldn't I get it towed
It runs at a high idle at all time never goes below a grand and a half I need to adjust it to where it is at or below a grand
on the fuel tank gauge not reading right.
Service engine soon light constant. Just tuned up, oil change, fuel pump replaced.
85000 miles. SLE 4wd
My speedometer isnt workin either
car stalls all the time , starts back up but stalls out as soon as i take foot off the gas
Replaced battery, starter, checked all fuses, tested altenator. Why wont it start?
2nd combo switch in a year. but there is no lights the wipers work but no signals.
For this vehicle what is the average high miles.and the most common part that needed fixing
We've already replaced the water pump, and flushed the radiator as well as changed the thermostat twice, Everything was running fine for a while but it's happening again. He changed the thermostat the other day and added coolant to the radiator, it fixed for about 24hrs now it's doing the same thing again.
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