Granted mine is a 94, still Series 1 SSEi...
1. - Miles - 158,000 motors still strong, has a tick and exhaust leak but still strong... i think the tranny is getting a lil weak tho, slips occasionally, will be serviced in 2 weeks, ill update then if it gets better or worse
2. - Id say it would run mid-high 14s stock with a good takeoff, lots of variables, hard to say... once i get mine running right ill take her to the track and update on times at stock.
3. - I get an average of 18mpg city, 24 solid highway at 70mph and im having a 02 sensor light on and off, so its prolly a lil lower than it should be if the engine was at optimal performance, bosch 02 sensor is crap, replacing with acdelco 02 tomorrow (payday
4. - No clue... but it could be an over-exaggeration and it might just need new bushings... need to know for sure first... but if all else fails, you have only spent 1000bux and its all there, parts alone would match that much $$$
If i were you id get it, if you can, slap a new water pump, plugs, wires, air and fuel filter, and giver her an oil change and see if she still stumbles under boost, if so there should be a code for something and we can go from there