I have a 1996 Chevy Silverado 5.7, Everything is stock, have never had a problem. Lately it has been lugging, spitting and sputtering pretty bad and only getting worse. The best way to acknowledge the problem is to come to a dead stop and stomp on the gas. It used to chirp the tires a little bit, but now it limps up to about 10 mph before it feels like it clears out. My oil pressure is normal, temp doesn't go up and I just replaced the fuel filter trying to troubleshoot a little bit. Need some help! Thought it might be a vacuum line??