When I did my 350 vortec with a lt4 hotcam engine swap I went ahead and swapped to a 411 PCM. On initial startup it wil idle down to 200rpms and almost die (sometimes it does die) and then go up to 700rpms and idle somewhat like it should. It's a straight shift and doesn't have anywhere near the power it should. When I shift into third and give it gas the Rpms go up high, but it doesn't actually seem to have power until the Rpms drop. I've checked pretty much every sensor on the engine, the wiring, replaced spider injectors, and have had a crank relearn and camshaft retard set. The guy that did the relearn said the PCM's temp was reading around -40*. The gauges read correct and when I hook my iPhone up to the port it reads correct. Also I have one two wire temp sensor. Most of the sensors on the 350 are off my 4.3, I've cross referenced them and they're the same part #'s. I have a 5.7 MAF ordered since theyre slightly larger, i know a guy that ran his 4.3 and it caused it to run somewhat worse but he didnt experience anywhere near the problems i am. My phone says im getting around 21mpg and is throwing a p0172 and p0175(rich in both banks) and sometimes a p0300(random misfire)
what could it be?