I have an 2002 chevy blazer 2 wheel drive. About two months ago it had a hard start like the batterey was low. But it finally started. But when it did it would not idle. I had to keep my foot on the gas to keep it running. After driving at 50 mph it seemed to go away until today. The last couple of days when I went to start it, it had to be jumped. And then today it won't idle again. It is charging the batterey but something is drawing on the batterey while it is not running. Checked all lights and such and found nothing. But I also noticed the fuel gage is jumping all over. Could it be the fuel pump is not running correctly? Any one have any idea's love to hear them!

Thanks!