I have a 91 Chevy C1500 with a 4.3l out of a 93 astro van that burns oil badly, it smokes upon start up and I just noticed tonight that it was smoking when I was driving. I've got oil all over the underside of the engine, the trans and almost everything in between. Just did an oil change and put Lucas in and still smokes. I've looked it up and the only thing I can find is to check/replace the valve stem seals or guides but it is having a slight problem driving now where it will stop at 30mph when my foot is down and then itll just jump as of it got a boost of power and so now I'm thinking its the piston ring, (because my plugs arent firing off properly due to oil goop build up) but I'm not sure. I normally dont mess with 4.3l engines as much as i do a sbc (my mom has a 99 tahoe I work on and it's got a 5.7l sbc 350) and I cant figure it out. I just check the oil after letting it sit for an hr (8:30pm) and the dip stick is dry and I did an oil change 5 hrs ago (3:15pm). I'm now thinking it's the rings but I dont have a garage to work in and I'm working as a manager for little Caesars making (7.75/hr) little over minimum wage (7.25/hr) and working on a budget living in the truck. So any advice would help tremendously.