I've already made a few posts about this, but every once in a while while idling in neutral the rpms will pulse. 700-1100 back and forth for about 30 seconds then it will smooth out and idle fine. But if I run it hard at high rpms then slow down and put it in neutral at a stop light or something the idle bogs down and bounces around 300-500 rpm then dies. It won't die if I do a wot redline pull and keep it in gear. It only dies after high rpms then being put into neutral. I thought I solved the issue by changing the idle speed put apparently not. It has a new iac, icm, tps, plugs, wires distributer cap and rotor and a new ecm. The tps and iac have been adjusted. Fuel pressure was 33.5 at idle with the vacuume line plugged in so 43.5 without it plugged in. I can get some live data but what would I be looking for in the data? Thanks for any answers, and I can provide more information if I forgot to include something.