Ok, this problem is really worrying me and I dont want to drive my car any longer than I have to with this going on..

Recently I made about a 1200 mile trip, and at the end of it the car was running like crap. Bad acceleration, revving the engine sounded weird. Then when I got back, driving stop and go to school, it was dying at stoplights. I changed the oil, and it has only done it a few times since then, but performance has remained crappy, and after driving it hard there is this decently strong nasty burning smell, similar to rotten eggs, under the hood and in the car. I changed the fuel filter, still does it.

I checked the spark plugs, they look abnormally white. I am thinking it MUST be running lean.

oil levels seem to be fine, possible burning more that normal, but not horribly bad.

this might also have something to do with my possible pinging situation, as posted in an earlier thread.

I am thinking it is the fuel pump, and it is running lean. I am prepared to buy a fuel pressure gauge, but does this appear to be obviously something else to someone?