Would be a good idea to monitor whats going on with the
MAF also. Mine went recently and would randomly throw up crazy numbers for a split second. In the workshop area there are some
MAF numbers you should be seeing.
Also vac leaks are common and if the fuel trims improve with more throttle its a good chance. I found a home built smoke tester worked the best but there are a few methods(hose up to ear works good also). Make sure you check around the intake manifold,
pcv valve(make sure its still secured in the grommet and sealing), and the hard plastic fittings around the coil pack area.
If you go down the smoke way I found disconnecting the brake booster vac and going straight to the manifold worked great.
Good luck.