Drove six hours to Seattle and first noticed the problem upon arrival. With the gas down halfway or more the engine accelerates like normal. Anything below halfway the engine shakes and loses power. When releasing the gas the car idles down to 500 rpm almost like it's about to die and returns to normal idle. If I floor it before releasing the car idles down like normal. When I got back home I replaced the fuel filter, put new gas in with fuel cleaner, did an oil change with seafoam, and changed the plugs and wires. No change, what could this be?
I should note it's the 2.5 4 cylinder. Timing is good, took map sensor off and it ran a lot worse. I don't see anywhere I could hook up this fuel pressure kit to the fuel line. It's all metal tubing except above the fuel tank. There was no sign of tearing or faulty hosing.