So I finally got my 3.0 back together with e/b built o/s valve heads, modded the crossover per my previous post, and got all the hoses back in the right spot and dialed in the ignition, and walla it runs. The first test drive or too it felt fine other than an exhaust leak where my crossover eliminator ties into the downpipe, too be fixed.

Trouble is, I drove to work yesterday ~15 mile 1/2 hour commute, first time the engine really warmed up since the rebuild. Now I notice at idle it misses a bit and kinda stutters until it gets a bit of gas. I'm befuddled as to what is causing this.

I did have an engine light that would intermittently come on, and after checking the two 02 sensors, the rear one was out of range and replaced, and now no check engine light.

Any suggestions greatly appeciated. I did replace the rotor and cap before the rebuild, and put in new plugs. The oil and coolant looks fine.