Oil or fuel??
 

Hey guys I have a 95 k5 blazer 5.7 4x4. On acceleration the truck moves real slow but as soon as it gets going, maybe around 15-20 mph it accelerates great. The initial though, it's like it has no oomph to it. I thought it might be the heads, but there's no knocking or ticks. So I'm thinking it might be an injector problem or oil pump. The oil gauge does go crazy but I'm thinking it just needs a sending unit. I recently did a major ignition tune up and changed up the oil switch. Any thing helps, thank you!