94 6.5 low rpm hwy

[mseybold]

Inhertence running ok till 2000 rpm about 60 mph . Has 5 manaul trans. Will chug once while . Some whiteish smoke out tialpipe when try to accel faster.

[mseybold]

Found issue lift pump not reciving power after warm up. When jumper wire at relay direct runs great! I'm checking wiring schmatic will find what's wrong an let know. Going camping!

[trbankii]

Couldn’t figure out your original post, but the OPS (oil pressure switch) is what controls the lift pump. So either a bad switch or you’re losing oil pressure (more likely the former).