My 87 was running well until just recently when there seemed to be a little hitch in the power at highway speeds. I would be cruising around 70 and it would feel like someone tapped my brakes?! Now it happens all the time and at 1800 RPMS. It really falls flat on its face. Total loss of power. I cannot climb a hill on the highway or even start from a stop without an issue. I am at a loss here. The truck is totally redone and the motor only has about 10k on it. My first thought was that the fuel pump was going but that doesnt seem right because the drop is so predictable at 1800 rpms. I checked the plugs and it appears to be running lean so I was thinking that it is a fuel starvation issue. I also pulled the o2 sensor and cleaned it but it looked fine too. COuld it be something with the FI? I dont know but it is getting to be a real issue so any suggestions would be great.