So I have a 3.1. lh0

The car ideals fine and runs well for a few mins after a cold start. Then after it heats up a bit the best way I can describe it is bucking repeatedly while under load(worse going up hill). The car never stalls. Originally I checked the fuel pressure which would only get up to around 30 psi and fall very quickly like in 5s. Well I eventually got in to the fuel tank and replaced the pump and there was this big coupler thing which I switch out for a piece of fuel hose and some Jose clamps. The pressure holds better, but it still drops about 10psi or so every 30s. I checked under the car across the fuel line while some one primed the pump. I could not see anything obvious. Checked around for pin holes in the sender while under pressure. While ideing the pressure holds at 38psi. I have not checked the fuel pressure while driving.

I have also replaced the cap, rotor, icm, coil. The spark plugs are relatively new. It does not do this while idling, so I thought that ruled out the spark plugs. The learn block multiplier has been high like 132+ for a while now. Any thoughts?