I have an 03 GMC Sonoma 4 wheel drive with a 4.3 vortec.....I've had issues on and off with a chugging problem but it only happens once in a while.....but this morning on my way to work my truck was running quiet well. I took my exit off the high way and drove about a mile down the rd. Took a turn down the road my office is on and my truck made a pop sound...i'm trying to drive up a hill and it pops again and i lost all oil pressure and have no gas when i push the gas pedal down. I still had power....radio on, heater working, but my truck wasn't going to go anywhere. I stopped and looked under the front and back of my truck and there was nothing leaking out...looked under the hood and nothing seemed to be leaking there either...It wasn't over heated either. I let it sit for a minute...I go to start it again and it started for a quick second then died right away.....I need help, I have no idea what it is and I can not afford to take it to a shop. So I have to get some ideas....i am wondering if it is something to do with the fuel pump. The fuel pump is only about 2 years old though and was bought brand new. But the chugging problem i said i had from time to time started after the fuel pump was changed out. PLEASE HELP!! I have one vehicle and 2 girls to provide for. So i need solutions to this problem ASAP. Any help would be MUCH APPRECIATED!!