The vacuum line with the shiny new hose on it goes after the MAF (the other one before the MAF as you have it).
The other possibility is that the Spectre MAF 'section' itself is the problem. One trick CAI makers use is to increase the diameter of their MAF section slightly, which fools the computer into thinking there is LESS airflow than there really is, making the mixture lean. On most stock engines, leaning out the mixture a bit at WOT will gain a slight amount of power (which is where a lot of the CAI 'power increase' claims come from). The ECM will generally relearn the long-term fuel trims and adjust for normal driving, but the short-term fuel trims will always show lean, and sometimes throw a code.
If it were me, I'd go back to stock. With that setup, you've got a 'hot air intake', unless you build a box around the filter to keep hot engine-bay air out and route colder air in from the fender well (like the factory box). You might have the potential for more airlow with that filter over stock (and it will make more of that cool noise that makes you think your truck is faster) but the engine doesn't NEED (thus can't use) that extra airflow (unless you have a supercharger) but it does need cold air to make the most power. That setup will likely net less power on a hot day than a stock setup.
