1999 Oldsmobile Intrigue no one knows the problem

I just took my car to a second auto repair shop, the first one changed the fuel filter, replaced the cam censor, a new belt, but it did not fix the problem, it was running fine, I was leaving work and it did not want to start, when it did start it ran as if it was about to run out of gas, as I continued trying to keep it running it started to smoke from the tail pipe and the hood, black smoke, after I sat a while it took off as if nothing was wrong, the next day it started fine then after about 10 minutes I turned the engine off and it would not start again, seemed as if it was not getting gas, later it started fine and drove like always, then the next time it would not start, waited a day drove it to the second shop it drove fine, now it will not start. No codes show when put on the machine.