surging

My chevy 350 surges at weird times. Ill drive to work and it goes 65+ mph no problem but the drive back, it sputters like its out of gas and wont go faster than 35mph. Sometimes it wont even go past 25. If i hold the gas pedal down it sounds boggy and when i release it fast, it backfires. Ive...

I've had this intermitent surging problem with my 96 Chevy. It has a vortec in it. I would be driving down the road and it would start to cut out and hesitate. If I pull over and let it run that way for a few minutes it would eventually run properly and I would continue on. It sometimes does it...